If you are going to pack up the dog in the old Vauxhall Velox and trailer
Is it still 1955 in Oz?
they've all rusted away here long ago.
Our customs are a law unto themselves and will do whatever they want. They have more power than the Police.
1977 I came back from Spain, in the back of the van was a Rudge, an AJS big port, and a Brough 680, draper spring frame; sounds good but they were well rough.
At 3am customs were very bored; pulled me over and went through the van, then started on the bikes,trying to suss a value to charge duty on; their reference point?
....a copy of Exchange and Mart, not exactly full of adverts for same bikes.
Stymied, they pulled a figure out of a hat, reduced it by my personal allowances, and worked out 37p duty for each bike. An unbelievable waste of time for all concerned.
You cannot question or challenge HMRC, on anything. I have had worse experiences with them in 30yrs of back and forth vists and trade.
It'd be interesting to know how the OP got on?