I like the latest version.
A couple of years ago I found a set of sample gels which I think were from Honl. Not this set (http://www.henrys.com/4620-HONL-PHOTO-GEL-KIT-2-CORRECTION.aspx) but they look like these. A band of Velcro fuzz goes around the flash and the hooks are on the gels. I think it cost $15 or so. Definitely more than a couple of pounds, but reasonable. It looks like a sheet of Lee gel is $9: http://www.henrys.com/2719-LEE-FILTER-GEL-20X24-1-4-C-T-O-206.aspx
My Canon 600 EX RT flashes came with plastic holders that clip on and pre-cut CTO and 1/2 CTO gels, in a little wallet.