If you're looking for things to worry about, remember if you put the chip on your left foot you should cross the start line right foot first and the finish left foot first - it could make 0.2 of a second difference
I guess that one of the important things about the course length is that whether it's right or wrong it's the same for everyone!
The blue line isn't the fastest route in London - it's just a guide.
Hugh Jones said in his Marathon Talk interview the shortest route is closer to the edge than the blue line, the reason it isn't painted closer to the edge is because of the width of the vehicle that paints it, it goes as close as it can to the edge.
For the girls, if you aren't as high up in the results as you thought you should be, we've already spotted in the photos that 'Avril' and 'Lisa' who were in the top 4 W45-54 were men, so if you were near the top of your age cat it's probably worth checking.
Hope you're all recovering OK and looking forward to next year or depending on how you feel!