Can I join in? 10K PB 51:34 (although I wasn't very pleased with that!), HM PB 1:51 in September (my first and only half). Aiming for sub-4, but 3:45 if I'm absolutely honest.
Interesting that although we have the same end goal (i.e. sub-4 FLM) our approach to training varies massively. Welsh Poppy and Higs are really racking up the mileage, whereas in my training schedule the long run doesn't even reach 18 miles until mid-February. I'm using the Hal Higdon Intermediate 1 programme (www.halhigdon.com) and am basically concentrating on slowly increasing mileage, especially on the long runs - but taking it steady as I don't want to get injured. I'm not doing any scheduled speedwork but I seem to be running long runs at about 8:40 pace at present. I think this is probably a bit too fast for a LSD but can't seem to slow it down.
WP, don't forget to enjoy the day. FLM is supposed to be one of the greatest experiences you'll ever have, and it would be a shame to miss out because you're focusing too much on getting a good time.