I really don't know what to do about London...
I ran a 7.5 mile undulating race last Sunday in 55.34, which felt quite good and I seem to suffer less if I run faster.
But obviously I can't be running that pace in the marathon, especially as I haven't been able to train properly for a marathon.
So, do I go for a run/walk strategy as in the Miami marathon... or do I run as far as I can at a steady pace, see how my leg copes with it and deal with any problems if/when they happen.
Maybe I should just go out one Sunday just to see exactly how far I can run non stop first
