Hi, I am in the uk quite close to you and have just bought the supermoto version, services are oil changes every 3000 and oil and filter every 6000 so very low service costs, you may need to spend around £2500 to get a decent wr250r , the cheaper alternative is a tt250r which is Yamaha and I owned one before trading in for the wrx. There is a new uk / euro forum just started up for the wr250r / x which is more uk based.
http://wr250r-x-euro.activeboard.com/
Hope this helps. Adam.