I'm doing the half, though I don't have a ticket and it's sold out
Training is now going fairly well. I'm doing a jog, a medium sized run with "up tempo" and a long run each week plus two sessions of squash and either another session of squash, a road cycle or another run.
I reduced my running to once a week during June, July and August while it was pouring non-stop and I found getting back into it pretty awful. Constant leg pain on shorter runs and not finding my stride until very late on longer runs. It is improving though.