You can show you have less than 8 seats and less than 3.5tonnes so should be easy enough to contest...., Good luck.
Maybe they don't want people coming from Wales. Can't say I blame them! (That was a joke, Welsh people are really nice, look you.)
Got my £8.00 refund!!! couple of weeks ago but forgot to post Put me off trying again tho, went the m6 route to IKEA this week