the gel info should be on the IMUK website
personal needs bags are just that - personal needs aka whatever you want in there. when you register, you are given these and you deposit them on race morning marked with yiur race number - they then get take to the special needs stations ready for the athletes to collect them. finding them can be a 'mare though!!
people put all sorts in - generally some foodtsuffs they fancy as a change to what's on offer - or additional fuels/gels of preference. savoury foodstuffs are popular just as a change to all the sickly fuel/gels/energy bars that have been consumed. a mate of mine used to have a salty tomato sandwich; others have marmite sarnies.
and they don't get returned after - if you don't collect what's in them, it will get dumped. unlike race bags which have kit in and hang in transition for collection - athletes collect these after they finish.
Edited: 15/05/2012 at 16:48