hi,
i was in the same situation,so i filled in the change of keeper in my name and address and sent off the old style v5.a few weeks later got the new one.This was great until i tried to get a tax disk......the new v5 still had tax class as "bicycle" and the post office wanted to charge £70 odd pound for road tax!.....so off to local dvla office who gave me a free tax disk and sent off my v5 for alteration.Just got the lastest v5 with "historic" tax class........Although i think you will have to it all via post as i think all local dvla offices will be shut by mid october
good luck Rob