My local secondand book sh--, er, well, though its technically a 'shop', its more accurately described as 'an avalanche apocalypse of paper'... DID have a bunch of those (certainly from ten up). Havent seen them for a while, but they could feasibly be buried under the piles of Valiant, warlord, lion, look and learn, eagle, later 2000AD, megs, beanos and secret wars. I'll have a look next im there. They were 50p each.
SBT