I'm positively acquatic....no wait, ecstatic 
Arrived at 9am, spent a while wondering round as stewards hadn't been informed where meet and greet area was where I'd agreed to meet my team. Didn't find it but decided to go and get ready instead. Don't wear jeans as your in transit over running shorts gear if it's pissing it down. Just a little tip there. Absolutely unbelievably sodden, so much so that tannoy was waterlogged and couldn't hear announcements!
General genial atmosphere, staggered start worked well for me as didn't have to do too much weaving. Heard about shoving but didn't experience any on this race. Had little home made pace band on my wrist and really helped me pay attention to my own pace, just made sure I hit each k mark within the right time. Every so often I would remember to appreciate I was running through central London, but I have to admit a lot of the time I was just thinking 'running'. Can't actually remember a lot of the race although I was grinning most of the way round. Massive kudos to the brave souls who actually stayed out in the atrocious weather to cheer people on. To be honest it was ideal running conditions for me but I can't imagine standing in it.
At 8k I realised I was well inside my time, feeling comfortable and the crowds started to appear as we headed towards Trafalgar Square to run down the mall. It was pretty amazing to be running that bit of the route, and I decided to step up the pace, if I felt good then I was going to belt the last k. I think I really started pushing just as we hit the Mall, and had a full pelt the whole way down.
Official time: 55:59! I am so pleased
But also now itching to do another 10k, because to be honest I think I still had some gas in the tank in the last few k. And of course now am thinking....if I'd only pushed it a little bit harder in the middle section I could have got under 55mins! Good thing I've signed up for one at the end of June...unfortunately I think it will be on track, which could be dull. I will be praying for rain....
DP, can't believe you are voluntarily going out in this weather
Great to run in, not so good to start or finish in