My God, these are all looking so familiar. Were they sold in newsagents?
@Bollops I seem to recall they used to come on the back of cereal packets, or as giveaways in the likes of Star Wars comic etc.
They were sold wherever toys were sold, but they were often used as free gifts. I remember my Mum bringing me a couple of dioramas (i.e. the big 'uns) and a couple of the smaller ones to keep me occupied in hospital after I had my tonsils out.