I was at the Book Palace today, looking at other art, and they have a few of the b/w pages from the last Mike Noble b/w strip and one or two pages from the Follyfoot Holiday Special as well. They also have the complete six page b/w strip drawn by John Cooper from one of the Look-in Television annuals. These are not listed on their site but I'm sure any serious queries would warrant a sale.
Artwork by Martin Asbury and Stanley Houghton (the very last b/w strip) is also listed for sale:
https://bookpalace.com/cgi-bin/ss000001.pl?page=search&SS=zFollyfoot&TB=A
