Thanks Gentlemen. Well said Lance, " spares and scrap" is a wonderful summary of the methodology. I might have to borrow the term in future.
Ian B Can't say I've ever come across vacs of the DH1 and DH6, certainly not when the builds were started. As for the Blue Rider conversion kit I tried for one on eBay for it went for silly money. Then I got the DH4 kit for a fiver +p&p. Had to build it then.
Regards, Steve