I like to use a "hands free" torch, one that can clip on to my body armour or jacket. In the past I've used Peli Versabrite, but found them quite fragile. Both of the ones I've had have broken.
At the moment I use a Pentagon light, that I can attach to the radio loop on my body armour. This does me fine just now, but all our new kit is covered in airwaves docks, so I can see me investing in a new torch soon that clips on that way.
Our vehicle are supposed to have hand lamps in them (but they have a tendancy to go missing) so if I am at a call where I know a torch is needed, I'll take one of them out the van.