OK, now that's spooky. A different edition of this was probably going to be my next post. Mine has a dark blue HMSO cover with caption 'A guide for young people'. Kind of 'build it and they (and They) will come'.
Ah, mine says that about the young people, too. It would be nice to see a colour variant.
That's lovely. What sort of size is it?
A5. Oh, unless you mean Stonehenge itself, which is much bigger.
And from 1975 the slightly starker looking blue Eighth Impression. CoverNot that painting from Children of the Stones