Was going OK for a GFA time and then started to get symptoms that felt unnervingly like Andrew Marr's description of a stroke. Stopped at a St John's tent, blood pressure, sugar and pulse OK, vision returned after 10 mins or so. Nurse then wanted to take my core temperature rectally, at which point I decided I was well enough to continue (!). Jogged to the finish and oddly enjoyed just showing the crowd a bit of appreciation, but I bet the sub-3 thread hasn't seen too many splits which included a 27 minute mile. Nasty headache now - suspect it was just a sudden migraine, which I've had a few times in the past.
So that's my excuse for a 3:47. That's it for me for London. One day when I have enough free time to take four months off to ski and run and do little else I might be back. All the best.
Not the London one though, the Gaza one. Local authorities (i.e. Hamas) wouldn't allow women to compete so the UN, in a rather uncharacteristic show of spine, canned it (something I learnt from the "Distance Running" mag at the expo).