[Ollie]

Can't say as I spend much time in woods but when I have been I have found that the best way is to find a spot that you think the birds are most likely to frequent and then stand still. It's surprising how near the birds will come to you. I can still remember a couple of years ago being on the edge of a wood when I heard Long-tailed Tits calling. I stood very still and they came within feet of me, could almost have reached out and touched them.

I find this type of approach works quite well even if not in a wood. Of course you have to be patient and there is a chance the birds won't show at all but I have had more success this way than by constantly walking around.
Roger