Hi and welcome! There are many reviews of the timeshares in the UK- go to the resort review section of Tug and check them out- there are hundreds. After that, if you have specific questions, post them here on the Europe board and I[m sure someone can help you out.
We have stayed at time share in London (Carlton Court) and Edinburgh (Eburgh Residence) plus several independent trips to the UK. The main consideration to us is, do you want to rent a car and get used to driving on the left side of the road? I know many do it successfully but my husb never wanted to try (and he has driven professionally) so we take day trips by train and occasional tours. So transporation is one thing to think about before you book a timeshare that is not in a city. Other than the cost, can't think of another single thing that is not wonderful about traveling in the UK!
We had a great unit, wonderul location in Lymington, near train and ferry and yes I drove. It was ok, I felt more comfortable as I went each day... we loved MacDonald Elmers Court, beautiful grounds, friendly stafff and a nice kept unit !! You should give it a go.. you would love it.
We stayed for one week at the Moness Country Club, just outside the town of Aberfeldy in Scotland. We had a great one bedrm unit. We did have a car, so from this location were able to visit quite a large part of central Scotland.