Well....pleased to report my first attempt was a success! And very very yummy.
I took advice from here, and added a couple of small teaspoons of sugar free jelly (dissolved in in hot water first - make sure you properly dissolve it or it goes a bit lumy as mine did!). Then filled up with cold water to 200mls, added a strawberry pack and whizzed it all up with the blender. Put it in the fridge and let it set. I think 2 hours would be enough for it to set properly, but I didn't eat it until about 4 hours later - not sure what effect that had on nutritional content?
Anyway, it was very creamy and a real change from my usual strawberry mousse so for those in RtM, or about to go into RtM, I would definitely recommend it. Will try another flavour with a vanilla pack I think - will report back.
Thanks,
Leesy
xox