Well, McGoo, you've done it again. Thanks to everyone (especially Cliff and frugalweaver).
I had an old leather belt (35mm wide) and fortunately due to having an ample girth, plenty of length.
Cut some pieces of pine that were about 33 mm wide at 14 inch intervals, and glued the leather to the wood. Raced off to the hardware store and got some grey (coarser) and white (medium) compound. I cannot believe how much of a difference it makes on some knives.
It's as though the very old Gerber (BL identified it for me as a Folding Sportsman III) is now just like the factory edge it came it. I thought I was pretty competent putting an edge on it, but I have now realised how much I was fooling myself over the years.
I'm sure it's still a long way from the edges you guys can conjure up, but I am absolutely chuffed with the results on the homemade strop.
Thank you for all the patience and superb advice guys.
Cheers
omniphile