Hi Barry, whilst I would echo Millsy and say go to a shop, to give you an idea I've worn Brooks Adrenaline for decades and fit into my normal shoe size perfectly
My training starts on Monday again so I thought I'd best start showing my face in here ready
Jedward - they gave a couple of gels out to each runner last year but I can't for the life of me remember at which miles they were, partly due to the fact I used my own.