Thanks for this. After much searching, I've ordered a tub of Magnesium Sulphate Cream (Epsom Salt preparation) made by Kirkman. 4oz tub (113g) for £20. It seemed to be the best value, and when it comes I think I'll put some into a smaller tube for carrying around.
Yay!!! Hope it's as good as I want it to be
Bram.