Live in Wales too! Have had a few Seats & done big miles in them, so obviously had lots of dealer servicing. After driving petrol loan cars, diesels feel very front heavy (because they are!) which makes turn-in a bit slower, once you're used to it you'll be fine. One thing you will enjoy is the lift-off oversteer, no problems getting a Leon tdi full across the road like a rear wheel drive!!! Company Toledo tdi (mk2, V reg) I had a few years ago was great for it!!!!
Got our black, Jan 06, 55 plate Leon 150tdi FR+ (enhanced) June last year with 15k miles & paid £12,500 for it - but it was a private sale, saw it on our favourite auction website & did the deal privately!
Economy, agree with Uncle Fester, any of you who are getting over 450 miles on a tank must be driving like old ladies or lucky!!!! My wife is lucky to get 400 with mixed driving, but she loves the power & its got the Dragon tuning box fitted - not a good as a remap I know but safer until its out of warranty imho.