When driving abroad, 3.5 tons is the limit for vehicles in built up areas etc. Whereas here it is 7.5 tons. Combine that with the change from 1997, meaning that from then, passing your test meant nothing over 3.5 tons, is it reasonable to assume that this was due to EU standardisation? So that we could now, if we wished, revert to pre 1997 status. Meaning that motor homes built for the UK market would be free from the hugely restrictive 3.5 ton limit! Happy to be corrected if I've got this wrong...