Oliver,

If the partsshop cannot get it, then try, http://www.autobarn.com. They have a K&N filter for your car.

Part number is E-2867
Height - 3.25"
ID - 13"
OD - 14.75"

This is for a sedan and am not sure if there is any difference for it being UK. Buy locally if possible, otherwise, give them a try.

Take care,
Brian W.