Terrible pun excused.
The first torch that goes in my pack is always a head torch.
You can get a head torch for a few pounds, the one I'm using most at the moment was 2.99 from one of the cheap hardware stores and it's perfectly adequate for most needs. Or you can spend a hundred pounds if you really want to.
Don't be taken in by all the hype about incredible brightness. A very bright beam is often more of an embarrassment than an asset. Make sure that there is a usable brightness somewhere amongst the settings, something a lot less than tens of lumens which is bright enough for spotting animals in the woods.
Rechargeable AA cells are about the cheapest way to run a head torch, and the more expensive torches thesedays have electronics which gives constant beam brightness as the battery runs down. That's very useful, but my cheap head torches don't, so I just swap the batteries when it starts to go dim. Don't get anything that uses button cells unless it's for very casual use, or perhaps just for emergencies. Button cells have relatively poor life when used in lamps.
Don't get a torch that will switch itself on when it's in your pack unless you're prepared to take the batteries out every time you put it away, or you don't mind having flat batteries all the time.
