There are specialist ISPs like Gigaclear who have connected up villages in Oxfordshire, for example[1,2]. I believe the model is you get a bunch of families to commit to the service and they deliver fiber to your community, if it's within their service area.

Deploying fiber can be done in a fairly low-impact way and as long as planners don't put up roadblocks, deploying fiber to remote locations isn't a massive challenge, as a number of rural deployments demonstrate.

[1] https://www.gigaclear.com/about/case-studies-testimonials/ [2] https://www.gigaclear.com/fastershire-rollout-schedule/