I did it! For a full report, follow this link.
And here's a summary of my training for the race.
Weeks of training: 19
Total distance run: 675k
Number of runs: 66**
Longest LSR run: 35k
Estimated total calories burned: 34,500
Tempo runs*: I lost count but I tried to run at least one per week.
Speed training sessions*: 1
Other training: lots of walking (thanks to the bus strike), yoga (2 x per week)
** I ran very little for nearly two weeks while I was travelling, then recovering from a nasty cold.