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I know they're not for everyone, but I really rate the GU gels.
I'm in training for the MK marathon in May, and I'm thinking in terms of GUs, plus cola bottles (which I prefer to jelly babies - £1 for a big Haribo bag from Aldi), and maybe a handful of Sports Beans. I'll rotate these as I go.
I'll be running with a bottle belt, so I'll always have water on hand to take with the gels, meaning I'm not married to where the water stations are on the course.