So much for getting back ASAP!
Thanks for your comments, lacebylady, comes of having a headmaster for a father and current job working with ankle-biters.
k, no, you're not daft, and you've given yourself plenty of time to reach those goals. FWIW, my advice would be to look at your HM and mara plans, see how long they give for training, assuming that they're probably starting from little base mileage. If you can, spend January and February building up mileage - what's your current weekly mileage? If you're aiming for a half, then a weekly mileage of around 25 - 30m should be fine, if you're hoping to do a marathon, then I'd look to build up your weekly mileage a bit before you start the training, if that's possible with family commitments. There are a lot of people who say that they get around on a lower mileage, but as a lot of mara training is about endurance / stamina etc, then the more miles that you can get in regularly the better. There's also this thing about the ratio between LSR and weekly mileage. You're going to have to get up to 20m in your LSR, so if you're only doing 20m or so a week, that's going to be a problem.
I managed to increase my mileage by going slowly, using HR. I did it in a month and without injury, so it can be done. You could do split runs - so you run the total amount in the day, but just half in the am, half in the pm. Doesn't give you the same experience as running the full distance in one go, but better than nothing.
Edited: 04/01/2011 at 22:30