I haven't gotten my Miniplanes out for some time to play with (
), so I don't have any "new" pictures, but I will forward on a few ebay pic picks. I don't know the extent of the Airfix offerings. Also, the sets are more common than you might imagine, but always come at a much higher price. This line is extremely collectible, and has been for nearly 30 years now, but the fact that the pieces aren't made of metal seems to have kept the prices down.
Once upon a time I was looking at a collection a fellow was selling and he felt that the various Matchbox items were of special value, and wanted the $$ for each one. He also had a big stash of Miniplanes but didn't regard them with much respect. Result? A few Matchbox items and a whole lotta Miniplanes added to my collection! I'll need to sift through the lot again one of these days.