Here is a link to a guide to filling out the V55/4 form that you need to complete.
https://www.gov.uk/government/upload...5X4_080814.pdf
If the V55 is the form I'm thinking of I seem to remember that I left the majority of the boxes blank. I 'kinda' used the V5 as a guide to the sort of information that was needed - if it was on the V5 I filled in the box on the V55 - kept my fingers crossed and submitted it. It turned out OK for me but that was 18 months ago and DVLA has changed a lot since then!!
Nigel