Well Lawrence depending one what I feel like and the weather I use one of two waxes.What do you use on your handle-bar?
I use "Got2BGlued"... You?
It's easy and cheap.
If I feel like a good strong hold that keeps being adjustable I use Cedar Hill Farm stiff moustache wax. It keeps very well but doesn't hold up terribly well in hard weather. Usually though I find myself using Hndlebar's Moustache Wax because that stuff will hold through a hurricane and the lanolin in it adds a nice masculine smell and some waterproofing. A tin of either will last a good while and if it is a little more expensive than Got2BGlued then I would say it's worth the money for the superior performance.
Another little trick that I picked up early in my handlebar wearing was using a wax toilet bowl seal! Haha only good if you like a soft hold but it does do the trick and you get a whole lot for your money. Cedar Hill Farm soft wax is a little better though but it is definitely adequate.