I managed a personal best and almost got the time I was aiming for - 9 seconds out, my time was 2:48:09 so was pretty happy given the heat and the crowds. The website tells me I was 300th but in closer inspection I was the 300th male and 317th overall, nonetheless I'm pleased with that.
The heat / dehydration / exhaustion got to me at the end and my face, tongue and arms were all numb and my mouth felt like I couldn't fit a pea into it. I lost the ability to speak properly for a while but after enjoying a free massage feeling gradually came back and I made my way out of the finishing chute about an hour after I'd crossed the line!
Thank you very much to all those who came out to watch. I managed to pick out most of you somewhere along the way and the support really spurs you along. And big thanks to Steph who has supplied the photos below.
Also, check out this link, it appears there were cameras everywhere!