Hi
I did get it registered but due to some luck and sleight of hand - I had to get attestations sur l'honneur for several things from my converter, Cavalino Campers, who were very helpful but I had to keep going back for more! Plus I was in luck in that my van was registered as 4 seats in UK before Brexit, so they ended up accepting the 4 seats. There were significant costs, several thousand, for gas cupboard upgrades, lights, mirrors etc. But the emotional stress was the worst thing.
I would add my advice to the 'don't do it!' I've recently sold my van, which was still in great condition but, being RHD and French registered, took a hit and had to sell for a significant discount. I bought for £30,000 in 2020, sold for 27,000€ in 2026 with not much milage, as I found I didn't want to do long journeys after all! I'd have done better to sell it in the UK while I was there - once I'd exported I'd have had to pay 30% tax to re-import and sell.
I'm taking a van break but my next van will be electric - I'm very interested in the Kia PV5 which seems excellent value and has a V2L plug socket inside the van, so could easily be turned into a camper with a couple of mattresses, a kettle and a little fridge! But mostly I use a van for transporting wood, pulling a trailer of horse manure, things like that!