From VLM site."Lucozade Sport Body Fuel, in an easy to carry 330ml bottle, can be found at miles 5, 10, 15, 19 and 23. We recommend you carry the bottle while you run, sipping slowly.
This year we’ll be back again with our Lucozade Sport Carbo Gels at miles 14 and 21 to help you get the fuel you need, when you need it."
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I work on the assumtion that a gel gives 20 mins of energy and takes 20 mins to get in to the system
So for a 3hr finish I'd take my last gel at about 2:20 (21 mile) then working backwards - 2:00 (18 mile) - 1:40 (15 mile) - 1:20 (12 mile) - 1:00 (9 mile) - 0:40 (6 mile) That's 6 gels.
Edited: 14/01/2013 at 01:04