So sportives are similar to gran fondos.

Jelly babies are basically slightly softer than jelly beans and shaped like a person, they're small, so 'babies'.

Jaffa cakes are essentially a biscuit. It's a sponge biscuit with a splodge of orange (hence jaffa) jelly (gelatine, not American jelly, which we call jam!). Then it has a dark chocolate layer to finish. Both items are full of sugar and well know among UK cyclists for their restorative properties. I'd be happy to send you some!! I guess there are less references to food in English sitcoms and films than there are in American ones!!