Better day today. We did some long line training in an open field first, then a walk in the woods. I normally let him off the lead in the woods as he stays close but he's been going further and taking longer to get back to us - minutes at a time, which feels like an eternity when you can't see or hear your dog - so I'm reluctantly keeping him on the lead in the woods too.
Anyway, he managed some loose-lead walking in the woods, which I think is pretty good with all the distractions. I'm also working on getting him to do a 'down' outside the house. He's always been very reluctant to lie down on command outdoors, I think it makes him feel vulnerable. I interspersed the loose-lead training with some 'down' training, just so he didn't get too bored, which he seemed to enjoy once he got over his initial desire to do a curtsey instead of a proper down! And of course I let him sniff every tree, bush, bramble...
As a side note, I have a dog walker take Henry on Friday mornings. He's been walking Henry since he was just a few months old but he's just told he can't take him any more because if he lets Henry off the lead, he disappears and does not come when called. If he keeps Henry on the lead, Henry pulls him all over the place. While this is a complete pain for me, I think in the long run it will be better for Henry, as he has been getting to do all the things with the walker that I've been trying to train out of him. Hopefully with a few months consistency and a bit of maturity on Henry's part, he'll be able to go out with the walker again. They adore each other, so it's a sad day.