Just had the log book come back for my car at long fecking last and on section 3 (front of V5c) it states the following

1. Declared manufactured new at first reg ...not worried about this

2. non transferable registraton mark

What exactly does that mean? I dont want the number thats on there but just looking to put a cherished number of my own on there which is on a retention certificate.

Any ideas to exactly what it means and has anyone else had or come across this?