Hi Neil,
Welcome to the forum
I had this same dilemma yesterday - Patrick and I went to help set up a local classic car show (Classics on the Heath), intending to help register vehicles as they came in, have a quick look around, and pop home to get more work done on our classics!
However, the judges didn't turn up, so Patrick & I were roped in to judge
Our dilemma was that there were a quite few Fiestas, Sierras etc. as well as almost brand new sports cars - how do you judge those against what I would call the 'real' classics like the Jowett Javelin and the 1950s Austins etc.
Of course, if you use the 1972 'Historic Vehicle' tax status, then there will be 'modern' cars included as well.
My own personal feeling is that anything up to 1972 could be considered 'classic', but of course, there are classics and there are classics, and that's just my opinion
On a similar note, a 96 year old friend has offered to give me his 1982 Honda Concierto - he reckons it's a classic as only about 200 of that particular model were imported/made, but I'm afraid it leaves me cold!
Ok, it's in excellent condition, only about 18k miles, always garaged (dry & well ventilated) and hasn't moved for the last 8 years! but I'm still not really interested in it as a classic
Anyway - on to the 'Classic Camper' question - we asked ourselves the same question when we considered starting LRCC, and I think we came to the conclusion that it should be Historic (up to 1972), and must be self-contained for sleeping, cooking etc. I really don't think a sleeping bag thrown in the back of a 109 could be considered a 'classic camper'; do you
Of course, there are no 'rules' as such, and anyone can join the forum; you don't even have to have a Land Rover, but when we are invited to display at shows, we will obviously pick the vehicles which best represent LRCC
As I say, these are all just my opinions, and I'm not imposing my views on anyone else (unless we are displaying at a show

).
Cheers,
Robin.