If you mean Barnsdale in Rutland, and don't want to drive, I'd probably pass. It's pleasant but remote, you'd probably have to take a bus to go anywhere else, and in our experience on-site dining wasn't great. Avid birdwatchers might enjoy for a whole week, but we drove even for that.
Does Tregenna in Cornwall ever pop up anymore? I loved it (altho some might have characterized as faded glory), almost in St Ives town where I believe there's a train station, beautiful coastline.
Wales, Pembrokeshire coast: both St Davids Vacation Club and Haven Court are excellent choices IMO, they're both in towns, with bus into other towns along the coast. If you can luck into an exchange in June, a visit to Skomer Island would be perfectly-timed for up-close puffin encounters, when thousands are nesting there. We've done that 2x, and I would go back every year if I could.