have a look here, tells you all about registering a vehicle :D
http://www.direct.gov.uk/en/Motoring/BuyingAndSellingAVehicle/RegisteringAVehicle/index.htm" onclick="window.open(this.href);return false;
I had the same problem when I fitted mine. I cured mine by sticking it in 2nd gear, loosening the bolts and pushing the reverse lock out plate as far to the left as poss, then tighten it all up. HTH.
Al
a pair of 15 x 4.5" wide 5 wheels
http://www.ebay.co.uk/itm/290601933690?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649" onclick="window.open(this.href);return false;
a pair of 15 x 5.5" wide 5 wheels...