I have started to make a list and a very geeky list it is too! The list has about 198 pairs and therefore nearly 400 separate entries and so far although I have seen about 200 I have only noted 4! It's very socially backwards and very exciting too.
The mega entry is unique and yellow.
It is ex-service, it is bright and it covers the whole UK each fortnight testing track (43013/14!)
I have seen it three times.