My old boss dave brown ownes Jet airmotive he breakes passenger jets.
Northacre industrial park, westbury, wiltshire.
I haven't got his number to hand sorry.
I went through all this with mine. better to go to DVLA and do it in person, then any discrepancies can be sorted there and then.
I also rang them like you and had the same response NO.
just sign the self declaration exemption form and say no more.
I was looking at tap and die sets just in case.
Also the oil filter mounting plate needs sorting as 2 of the 3 bolt holes are threaded.
The holes don't quite line up. who ever made it needs a toe up there behind.