Well, I did it! I got round in 3:33:29, so I missed my (optimistic) target of 3:15, but I can't complain too much. It was much tougher than I expected it to be -- especially the last 6 miles or so.
That's me, suffering on the way out of Canary Wharf, I think, observed by Marc, Jude Sam and Avi.
The crowds were fantastic, helping to make it an experience I'll never forget. I crossed the line saying "never again". The following day I signed up for next year's race!
Thanks again for your very generous donations.