I've used sugar substitutes for cooking and baking for over 20 years both in the states and the UK. First for my diabetic Father and not to make LC goodies for myself.

Equal is nutrasweet... look for Hermasetas, Candarel, or Sweetex to get the equivalent in the UK. All supermarkets and even Boots carry the lot of them. Asda does an 'own brand' version that's just 98p a jar. And I can't tell the difference between that and the expensive brands so guess which I buy.

Splenda is available in most of the larger supermarket chains also. But I've not been able to find and equivalent for the brown sugar flavour Sweet & Low that I used to get in the states. That was saccharin, which can have a nasty after taste, but it was good if used in moderation. Other than that I never use saccahrin anymore and can't say I miss it at all.

I use nutrasweet for things that don't get cooked, becuse it loses its sweetness if heated, and splenda for things that do.

Hope this helps... LC anything is incredibly difficult to come by in the UK.