On my v5 it says engine number not known. It's an import, I've googled it and there's loads of forum threads saying the same of imported bikes and cars. So is this normal? I assume I'm not alone on here?

look at your engine number, update the V5...and you will be happy.

I thought as much.

It's for someone who's interested in buying the bike. Not something that really bothers me.

It's all done at time of registration, if you don't fill it in they put not known.

Easy to update.