Glad it wasn't me. I forgot the anniversary two years ago (it's in late August). Last year I forgot the MOT (Feb). So I delayed the MOT till August (well, to be honest I didn't realise till August) so I when I remember that the MOT is due, I know I have an impending anniversary.
Or vice versa of course.
So when the car's knackered, will you have to swap the wife as well to match the new MOT?