Thanks for the comments. I'm still musing.... I think perhaps not MK as it *is* a new one, although it's relatively near me as I'm a Londoner. But I'm still sorely tempted by a marathon for 2012, especially since I mentioned this to one of the guys at my running club last week and he's been egging me one.
Hubby is supportive, and my 10 year old son is active and sporty, partly I hope because he sees me being active. I just know that it's a big chunk out of precious weekend time, and life's a massive juggle already. I work 4 days at a demanding job heading up a department and I know from my older child that these early years before they start school are so precious, and go so quickly. Thus the push / pull of wanting to pursue my hobby / spend time with my 3 year old daughter....When I'm training for a HM (as I am now), that's 2 hours which still gives us most of the time to do stuff as a family. From what I see from my brother, who has done lots of marathons, it's a full day out of the weekend for a good few months, as he's so knackered after running for 3-4 hours he's not up to much else for that day.
Training in the winter's not a prob, I'm happy to run in any weather unless it's icy. Time's the biggest sticking point...
Right will stop my ramblings now...