I started off fast this year trying to get space. Found the blue line after about a mile or so and hugged it for the rest of the race. Downside was that it meant I started too fast and was difficult to get back down to an easier pace until it was too late.
The symptoms started on the last practice race at the beginning of the taper/last week of the third section. At first seemed just a twinge and I thought would go as I was in taper but it didn't. Got quite worse in the week before the race. As I was warming up in the enclosure I had sharp stabbing pains in my shin. Did the race of course but was in pain towards the end. The adrenalin and the heightened level of fitness because of all the training enabled me to complete.
I think the fast repeats in the last section contributed rather than the total quantum of mileage. The consultant I am seeing said that over 40s heal a lot slower than youngsters and the faster you go the harder the impact/damage. If I am ever in a fit state to do a marathon again then I will avoid the fast repeats.
Just a word of warning on the P & D plan if you are over 40. I did the 50 to 70 plan last year for London and still haven't recovered from the stress fracture it caused and thus am out of the 2014 race.
No, I did my first half back in 11. My stress fracture happened when I was running 70 miles a week this spring when training for London. Hasn't healed yet because I foolishly went to a physio who told me to run on It....