“FibreNest is a UK-wide provider of ultrafast broadband and voice services. We are part of the Persimmon Group, who deliver 100%, totally unlimited fibre-optic internet access directly into your new home, supported by great customer service.” Frequently Asked Questions | FibreNest
Bascially they are a wholly owned subsidiary of Persimmon, the house builder, and have a complete monopoly over provision to all Permission properties. More than that, they own the cables between the green OpenReach cabinet in your street and your house. More details about the FibreNest justification for installing their own service is included at https://www.fibrenest.com/why-fibrenest
Some customers are happy with their service they receive from FibreNest, but of course some aren’t and this can be read for yourself on FibreNest Reviews | Read Customer Service Reviews of fibrenest.com
Obviously, mobile provision is available subject to coverage. Vodafone is anecdotally quite good although EE is poor (without wifi calling via broadband).
In order to get an alternative FTTP provider they would need to install cables to your property and those that have approached other potential providers have been told that this is not yet available. This includes BT/EE and Vodafone as of Jan 2025.
This effectively means that Permission home owners are not able to leave them. This also means that the typical features of market with competition, often seeing providers improving service, reducing costs and offering switching incentives may not be present.
Below is the marketing blurb from FibreNest, for their new customers.