If you did want to get a torch I can strongly recommend the LED Lenser Frogman as a nifty little one.
It's only small but runs for 50 hours off it's batteries, is LED so the 'bulb' will last forever and is blimmin' bright! (It outperformed the 3 LED hefty scubapro ones that the dive operator we were with in the Red Sea used)
Makes a great back up torch if you go for something fancier in the future too!
What's even better is that it's less than £40!
(Found this one (
Ledco 7456 Led Lenser Frogman Neon Gift Box - Ledco 7456 - LED7456 at Tooled-Up.com
for £37, you may do better than that still!)