Good question James!
There are a couple of clubs which cater for older vans. Please don't quote me on this, but I think one only caters for pre 1965, and the other for pre 1980.
As I said in an earlier post, I regularly attend the European Classic Caravan Rally, and their cut-off date is 1980, so I guess that is about the norm.
So, here's an idea: why not start a club for vans like yours, which don't fit into any of the categories? Say, post 1980, up to 1995? I'm sure there are lots people out there still using vans which fall between those dates.After all, not everyone can afford £20,000 for a new van!