<<<I notice a lot of new motorhomes for sale locally new with older registration. Some have been on the sales lot well over 12 Months now. I saw one as i drove by, a VW small conversion was 65K but the large dealer nearby has about 500 for sale and some are over 80K. >>>

Indeed, Bonny Geoff. I'm well in touch with market via couple of dealer pals and motorhome social media. There was a rush to buy and a shortage of m/homes at the start of Covid due to an overwhelming demand to the extent that new orders were being taken with an 18 months or two years delivery. Much of it due to closed factories plus 'finished' base vehicles awaiting parts (headlamp units, windscreens and chips for ECU's). The price of new ones rocketing by 30%.
4 and 5 year old ones were selling for far more than when new.
The bubble burst early summer and dealers have become completely overrun with stock, due in large part to newcomers discovering that m/homing doesn't suit them plus the economic situation means that those who bought on finance regret having the repayments, upkeep, running and storage costs now they are back to work after the shutdowns and the vehicle is little used.
My m/home is 20 years old and I've had it for 11 years, touring only abroad and for accommodation at bike rallies.
I've been on a m/home forum for ten yeas and there are many disappointed new owners and posts from others who sold their 4 and 5 year old ones at far more than they cost them.
Just for interest, during the height of the Covid boom the car dealer son of a lady friend drove a battered car from Huddersfield to Exmouth to buy an unseen m/home privately. He abandoned the car in a side street (maybe you saw it) and drove the m/home back to Huddersfield. He was never contacted about the abandoned car.