In reply to Herdwickmatt:
Generally nothing up to 90mins. Longer than that, it depends on the type of run - if a race, likely gels or bars. If it's more of a relaxed affair, I take tinfoil-wrapped toasted bagels with nutella and peanut butter, malt loaf (classic!) or if it's long and I'm likely to get sick of sweet stuff, buttered boiled new potatoes with salt.
I tried the homemade date and cashew balls - they were good but a bit faffy.