Postwar vehicles were in service for a long time, Ferrets were in service for over 40 years, 432s will have been in service for over 60 years when they are finally scrapped. In this time many thousands of people will have used them, even lived in them out on exercises or in small wars and peace keeping duties. Most of them have seen much more active service than wartime vehicles, anyone who thinks they are not worth preserving obviously didn't think it through properly.
I have found when I've had the Ferret, Spartan or Fox at a show (or even at home when working on it) that a lot of former crewmen always like to stop and chat about them. They all have stories, I met a bloke who froze when he saw the Pig we had. He wouldn't go in it and it took him a few minutes to finally talk about it, last time he was in one it had been petrol bombed and he was on fire. Another man used Ferrets in Malaya and had photos and stories of his time out there. We put him in touch with the owner of his old Ferret.
I think the 1940s thing is mostly an excuse to dress up and have a party.
Bedford RLs do turn up on ebay quite often, but usually painted in stupid colours and full of holes. You could of course buy a RLH, Withams have hundreds of them and can't give them away!
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Chris