My favourites:
My dentist has an Alpina M5 BMW with the plate "B33MER" and I used to stay at hotel owned by a chap called "John Arthur Goode" with the plate "JAG 1"
He replaced his custom executive Jaguar every year, but the plate was always worth more than the car.
I have to say I think this is the shallowest ego trip available. Is it just me who sees "TJB 4" and thinks "Yeah, but you're advertising the fact that there are 3 people with those initials who are wealthier than you"?