Thanks Anne and John.
I have the books, so know they were
supposed to have been made in all four colours - just beginning not to believe it. They must be rarer than hens teeth!
Just call me Doubting Thomas - if I haven't seen it it doesn't exist - or does that make me Jean Paul Sartre?

Would like to see a photo of Skegby's clear one if he/she is still around?
Thanks
JAK