Ruth thank you so much for your reply, it was also very interesting reading all the other insights too. You more than answered my question and I feel quite confident in my fueling strategy now. Will be practising it over the next 8 weeks
I am running London this year, having broken my marathon cherry in Edinburgh in 2012.
I struggled during the race, and with a subsequent marathon later the same year, around the 20mile mark and I am pretty sure it was due to insufficient fueling ...
I am most interested in when I should start to 'fuel up' in the days running up to the run and the best options food wise.
For the day itself, I have been experimenting and have found a breakfast routine that suits (porridge & banana) and my race fueling is looking like clif shot blocks as I find them easy to take on the run, easy to digest and they seem to provide the right energy at the time.
My issue just seems to be eating in the run up to the big race