I was in a grey A35 van, I think. I remember the TV series and repeating those catchphrases at school. That corner of Wales holds a lot of ancestral memories.
Nigel - I have a few sites I'd love artist's impressions of - you could try the local newspapers with them ! For instance, the Holymire circle - http://www.themodernantiquarian.com/site/4842 - (Hexham Courant, Cumberland News), Whitehouse - http://www.themodernantiquarian.com/site/3196 - (the same papers) and Thurstones - http://www.themodernantiquarian.com/site/5502 - (Bolton Evening News and Manchester Evening News). And there's plenty more.