Vehicle trace?

[Mike Costigan]

... I didn't realise their were parallel series for m/bikes and cars. Does that mean they used the same digits?

In some cases, yes! In the early days of registration numbers I don't think all the issuing authorities followed the same hymn sheet, but certainly Norwich (or was it Norfolk?) issued the same numbers to cars and motorcycles - my grandfather claimed he had AH 1 on both car and motorcycle at the same time!