Cuckoo Broadband Review (Updated 2026)
Customer Migration. Full Fibre. Onestream Update.
Cuckoo Broadband built its reputation by challenging the big providers with simple full fibre packages, fairer pricing and a premium eero router. However, this review now needs a major 2026 caveat: Cuckoo has stopped accepting new customers after its customer base was sold to Onestream, with its customer base, brand and domain expected to move across. Existing Cuckoo customers should see service continue during the migration, but new shoppers should compare alternatives rather than treating Cuckoo as a normal sign-up option.
Pros and Cons
What It Nailed
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Strong Full Fibre Packages Cuckoo’s C-150, C-500 and C-900 packages covered the main speed tiers most UK homes need, with full fibre rather than older copper cabinet broadband.
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Amazon eero Pro 6E Cuckoo advertised the eero Pro 6E router with its full fibre packages. That remains one of the better routers supplied by a UK broadband provider.
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Clearer Price Rise Wording Cuckoo’s current price book says service charges increase by £3 per year around 1 April during the minimum term, unless your own contract documents say otherwise.
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Existing Service Should Continue The customer migration to Onestream is expected to keep existing Cuckoo connections running during the transition, with no immediate need for customers to panic switch.
The Drawbacks
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No New Customer Sales The biggest change is availability. Cuckoo has reportedly stopped accepting new customer sales, so most shoppers should now look at alternatives.
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Migration Uncertainty Existing customers are moving into the Onestream era, so future support, renewal pricing and brand experience may not match the Cuckoo service originally reviewed.
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No Traditional Landline Cuckoo did not include a standard landline with full fibre plans. A digital landline was described as close to release, but customers should check current account options directly.
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Power User Details Vary Static IPs, port forwarding behaviour and router options can depend on the network route and account setup, so gamers and home server users should check before relying on advanced features.
The Infrastructure
How Cuckoo Worked
Cuckoo operated as a retail ISP using wholesale access rather than digging every road itself. The service used full fibre infrastructure through networks such as Openreach, CityFibre and APFN’s own fibre footprint, with the Aquila wholesale platform sitting behind the customer connection.
The May 2026 change is important. Cuckoo’s customer contracts, brand and domain are expected to transfer to Onestream, while the underlying customer connections remain on APFN’s Aquila platform. This means the line into the home should not automatically change just because the retail customer relationship moves across.
Hardware: The Amazon eero
Premium Router Choice
Cuckoo advertised the Amazon eero Pro 6E router with its full fibre plans. That was one of the biggest strengths of the service because many cheaper ISPs still supply more basic hubs.
The eero system is built around mesh Wi-Fi. If you have a larger house, you can add another compatible eero unit to expand coverage without creating a separate network name. Existing customers should keep checking their own account and equipment terms because supplied hardware and add-ons may vary by package, installation date and migration arrangements.
My Experience: Refreshingly Simple
The Setup
I signed up for the Full Fibre 900 package before the May 2026 customer-base transfer news. The signup process on their website was genuinely one of the easiest I had encountered. There was no upselling of TV packages I did not want, just a clean interface asking for my postcode and bank details.
The eero router arrived two days before the activation date. On the day itself, I received a text message at 8am saying the line was active. I plugged the eero into the wall box, also known as the ONT, and within five minutes the light turned solid white. I was online.
The Performance
I live in an area served by CityFibre, so my connection was symmetrical during testing. My speed test results were consistently hitting around 910 Mbps download and 905 Mbps upload. This made backing up files to the cloud incredibly fast.
I had one minor query about my first bill date. I used their online chat function and waited about four minutes to get through to a human, which was reasonable. The agent was helpful and clarified that the first payment is taken three days after activation. That experience was a pleasant surprise compared with many larger ISPs.
The Packages
Cuckoo’s own broadband pages listed three main full fibre speeds: C-150, C-500 and C-900. However, the key 2026 change is that these packages should no longer be treated as normal new-customer deals after the reported sales stop on 11 May 2026.
Full Fibre 150 to 900
C-150: The entry-level full fibre tier. At 150Mbps average download speed, it is plenty for a couple streaming 4K, browsing and working from home.
C-500: A strong middle option for families with several devices. It gives more headroom for consoles, large downloads, video calls and streaming at the same time.
C-900: The top advertised tier. This is gigabit-class broadband for content creators, heavy downloaders, busy smart homes and anyone who wants the fastest Cuckoo speed tier.
Upload Speed Differences
Your upload speed depends on the network used at your address. If the connection is delivered over Openreach, upload speeds on a 900Mbps package are usually much lower than the download speed. If the connection is delivered over CityFibre or another symmetrical network route, uploads can be much closer to the download speed. Existing customers should check their own account or router speed test rather than assuming the same result everywhere.
Performance & Speed
By The Numbers
Our testing over a two-week period showed excellent stability. We experienced zero dropouts during working hours. Latency was consistently low, hovering around 6ms to 8ms, which is excellent for online gaming.
Pricing & Current Deals
Value for Money
When evaluating Cuckoo Broadband prices against the wider market, Cuckoo traditionally sat in the mid-tier. You were paying more than some budget Openreach providers, but the premium eero hardware, full fibre focus and simpler contract positioning helped justify the difference.
The important 2026 update is that Cuckoo should no longer be treated as a normal new-customer deal page. The latest position is a customer-base migration to Onestream rather than a fresh Cuckoo sign-up route. If you are shopping today, compare live alternatives. If you are already with Cuckoo, check your migration emails, contract information and account notices before making any decision.
Cuckoo’s current price book also says service charges increase by £3 on or around 1 April each year during the term of your contract. Your own contract information, contract summary and order confirmation should be treated as the deciding documents.
Top Alternatives
If you cannot newly join Cuckoo, or you are an existing Cuckoo customer reviewing your options before the Onestream migration, consider these alternatives.
The Full List of Extras
Cuckoo focused on broadband rather than TV boxes, mobile SIMs or complex bundles. These were the main extras and service features worth noting:
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eero Security Features: Cuckoo advertised advanced security and privacy features with its plans, alongside the eero Pro 6E router.
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One Touch Switch: The UK’s One Touch Switch process means most broadband and landline customers only need to contact their new provider when switching.
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Account Management: Cuckoo promoted a handy app and simple account management. Existing customers should check whether any account tools change as the Onestream migration progresses.
The Trade-Offs
No ISP is perfect, and Cuckoo now has one very obvious limitation: new-customer availability has changed.
No New Sign-ups: The review score still reflects the broadband service tested, but Cuckoo is no longer a straightforward new-customer recommendation. If you are shopping now, compare live alternatives.
Migration Risk: Existing customers should see service continue, but support processes, renewal offers and future account management may change as Cuckoo customers move to Onestream.
Not The Cheapest: Cuckoo was rarely the absolute cheapest option. The value case came from the eero router, simple pricing and strong full fibre performance rather than rock-bottom monthly cost.
Ownership, Migration & Structure
From Cuckoo to Onestream
Cuckoo previously positioned itself as the “Octopus Energy of broadband”, using Kraken Utilities for customer and billing operations. The more important current update is the May 2026 customer-base transfer to Onestream.
Under the reported arrangement, Cuckoo’s customer contracts, brand and domain transfer to Onestream, while customer connections remain on APFN’s Aquila wholesale platform. APFN’s platform aggregates access across networks including Openreach, CityFibre and APFN’s own fibre assets.
FAQs
Is Cuckoo Broadband still taking new customers?
As of this 14th May 2026 update, Cuckoo should not be treated as a normal new-customer sign-up option. Recent reporting says Cuckoo stopped new customer sales from 4pm on 11th May 2026 after agreeing the transfer of its customer base, brand and domain to Onestream.
What happens to existing Cuckoo customers?
Existing customers are expected to continue receiving service during the migration period. Customer contracts, the Cuckoo brand and the Cuckoo domain are moving to Onestream, while connections are expected to remain on APFN’s Aquila wholesale platform.
Which router did Cuckoo supply?
Cuckoo advertised the Amazon eero Pro 6E router with its full fibre packages. Existing customers should check their own account and welcome documents because supplied equipment can depend on the package, install date and migration arrangements.
Should I switch away from Cuckoo now?
Not automatically. If your service is working and you are still inside your minimum term, wait for direct migration communication and check whether any future change gives you a right to leave penalty-free. If you are out of contract, compare alternatives before renewing.
How We Rated Cuckoo
To ensure fairness, we use a standardised weighting system across all our ISP Reviews. Here is exactly how the 8.6/10 score for Cuckoo was calculated. The score has not been changed in this update, but the availability and ownership context has been refreshed.
This approach allows us to judge the best deal for each customer without bias. Commission, CPA and margins are not used in the scoring model.
HASNAAT MAHMOOD
Broadband & Technology Expert
"Cuckoo was one of the most refreshing ISPs I tested, thanks to the combination of simple bills, good hardware and honest speeds. The May 2026 customer-base transfer means this review now matters most for existing customers and historical comparison. New shoppers should compare live alternatives instead of assuming Cuckoo is still available to order."
Editorial Updates
14th May 2026: Updated this review to reflect the major Cuckoo customer-base transfer to Onestream, including the reported end of new customer sales from 11th May 2026. Reworked the verdict context, pros and cons, package section, pricing section, ownership section, FAQs and calls to action so the page no longer presents Cuckoo as a normal new-customer broadband deal.
Score note: The 8.6/10 rating has not been changed. It now reflects the service quality assessed during testing, while the written review highlights that Cuckoo’s availability and customer ownership position has changed.