Registration for Bultaco Trials bike?

[Dunc6001]

I've owned a 350 1978 Bultaco Sherpa T for the past 10 years and only ever used it off-road.
It's not registered so no registration number or docs.
Engine and Frame number are paired so all original spec.

I can deal with the daytime MoT specifications and insurance at a later stage, but unsure of how and if I can get it registered.
I've looked at the V62 form and the first section asks for the reg number!!

Any advice anyone?

Thanks in advance

Duncan

[Dunc6001]

I suppose technically you are correct.
OK MoT with "no lights at time of presentation"?
It also looks like I have to get the bike Mot'd first, then insured via the VIN number, then apply for vehicle registration - so yes a rigmarole but I think worthwhile.
Will approach it one step at a time.