LensCoat makes a product called LegCoats which are leg wraps for tripods.
http://www.lenscoat.com/legcoatreg-wraps-p-1381.html?osCsid=067eb7b184abb6b2ff88abd88f8951a9
I've got a similar product and they work great The product is a flexible soft tubing that is cut to length and attached with two sided tape to the upper leg sections. Then you slide a stretchy cloth sleeve over the tubing.
The product provides padding, helps to keep cold legs off your shoulder and hands, and has both black and camo versions.
You need to select the size that matches your tripod legs.
I'm not sure whether they ship to the UK or have dealers, but this is the product you want. I think they sell through Amazon.