Honda-SOHC

OK, anybody had experience of importing a bike from the USA as an individual?  I've found the bike - well, a choice of three - more than 30 years old, and all conversations with HMRC point to a 5% VAT charge, and zero duty. But what other costs (beyond shipping) can I expect as unexpecteds? Destination port fees, customs checks etc? I can smell a few fast-buck "advisers" online, but not sure where the line is drawn between those pulling a fast one for something that should cost nothing, and those with a valid and valuable contribution to make.

Any intel or insight welcome.