Personally I'd go for a mains connected PV system if at all. Honestly... if you don't want to put money into it, you probably have to backfeed into the grid and get a good rate for your electricity. Otherwise you pay substantially more for the green power than for mains power.
Wind generators might be problematic in Europe, get info on UK codes on wind power installations. In Austria wind generators have to be something like 2km from the nearest residential building...
Some nice option if you got sunflowers or any other oil farming in your area are diesel fueled generators converted to oil. If you find one that really works (some I've seen only run 700hrs straight until requiring substantial maintenance).
