I'm not 100% sure where this location is, Chcklist. I thought it was somewhere very close to the heathland around Exbury, but I've never looked into it in much detail. What hampers the search for this location most, is the growth of trees, etc, over the decades. I did have a feeling once that it was near Lyndhurst, but the location was disproved by Mark Checkley, who was filming a F5 documentary in the area with Gary Russell & Marcus Harris a few years back. I've not heard whether the documentary was finished or released! I'll contact Mark to find out more.
I'll have a good look round when I'm next in the New Forest, which will be in the Summer.
Thanks, Anita. Yes, Five go off in a caravan is also one of my fav episodes as well. Watching the 1978 F5 series as a kid, I never imagined that I'd end up visiting the filming locations one day! Back then, I didn't have a clue where they were. They seemed so distant & unreachable!