Dave, you won't believe it but I searched for a tyre last night when I discovered my wee problem. I tried Tesco, 2 miles away and open 24 hours, I tried Asda 5 miles away and open 24 hours but they didn't have my size. So, I did what everyone else does, ordered one from Amazon,

then this morning when I woke up I remembered you had them on your site. Your delivery is normally quicker too.

never mind, I'll need a front tyre sometime.
I've looked at the Ambassador scheme and I'm giving it some thought.