As Charles said, you will get overwhelmingly positive comments here. This is the unofficial
DVC fan club.
For your situation from the UK, I really think it depends. There are many very happy UK DVC owners, and I'm sure there are some who wish they'd not purchased.
If you plan to visit WDW every year, or every other year for the foreseeable future, it might work well for you. But be sure to compare DVC ownership with other options available (discounts, offsite, renting from DVC owners, etc.)
If you don't plan on visiting WDW at least every other year, I would not buy DVC. Outside of WDW, DVC has only 4 other locations: Vero Beach, Florida; Hilton Head Island, SC;
Disneyland, California; and Aulani, on the island of Oahu in Hawaii. So it's very limited outside of WDW itself.
Yes, there are non-DVC uses for your points, but almost all of those are very expensive points-cost options. RCI exchanges are the best non-DVC opportunity, but if you want to exchange via RCI there are much better, less expensive ways to do that than DVC.
In addition, you have to remember that the bulk of the DVC cost is in the 30-50 year financial commitment to annual "dues." If your interests, finances, family situation, work, or anything else changes, you still have that long term financial obligation.
The other thing to consider is that DVC covers only the
lodging portion of a Disney visit. Airfare, park tickets, food, etc comprise a much larger portion of trip costs, and those are NOT covered by DVC.