The generic term for Jello which is not Jello is gelatin dessert. There are several brands...usually named for a store chain. For all I know, Kraft Foods makes them all under contract. (next time I go shopping, I'll look to see if any are being sold....we don't use them often)

But, if I were going to use one, I'd just say I have an off-brand Jello, since Jello has become essentially the generic term...even more than Kleenex as a tissue.

My question is: How do you in the UK differentiate what we call jams, jellies and preserves?