I live rurally in the southwest and it’s a beautiful area with a lot of homeschooling families (I used to work with them).
There is a massive gulf between most of those families and others, because of the cost of living here (house prices and cafe prices aren’t dissimilar to London but no London salary weighting), and there are plenty of other issues including:
Poor transport links- buses where I am are few and far between and very unreliable, impractical for commuting to a job and difficult for my teen when buses disappear, are cancelled, or late. Living here is more expensive than living in a city because of needing to drive, and to drive further. And jobs are limited.
Traffic is HORRENDOUS. Both the commuter queues into the local market town, which can easily double the journey time, and the amount of people visiting my village and parking along the green, and in any spot they can every single weekend and lots of evenings. Not just in summer either, although it’s considerably worse in summer. Parking generally is very tricky as cars get bigger and households have more of them (often because late teen and adult children can’t afford to move out and can’t get to work or post-16 education by public transport). Roads are small and bottlenecks develop very quickly.
Village schools here are either oversubscribed- some children living nearby don’t get places and if children arrive by car from further away there is then feeling- or closing down due to low numbers. Small schools also often don’t have the resources (staffing numbers and expertise) to deal well with children who have additional needs (friends’ experiences).
Rural poverty is a massive issue. The boating population here has changed from people seeking an alternative lifestyle to people seeking a step up from a tent- rents here are incredibly difficult to get and horrifically expensive (think north of £1500 a month for a 2-bed in the private sector). Double pre-pandemic prices.
All that said, i like the peace and quiet, and I do wish I lived by the beach so I understand your longing! However, my dd now at 16 cannot wait to move away to a more cosmopolitan area. Our location was lovely for her as a child. As a teen, opportunities for clubs, friends, and socialising are limited by the transport situation and the distance she lives from her friends. So I would think about moving closer to family- but maybe an urban centre like Bournemouth or Exeter so you have lovely countryside and coast on your doorstep but keep the advantages of the city.