Tried the cutting but such a sticky mess I lost the will to make the mousse. Tried Tesco here (which is supposed to be the biggest in UK) but they didn't have any. We have no Waitrose , although there is a rumour of one by Christmas. Will try Sainsbos. Thanks everyone.
The Nigella recipe is p*ss easy btw. I had a panic when it appeared like chocolate soup before going in the fridge but it set beautifully. I shaved some white choc on top and our friends were well impressed. [smug emoticon]
Tip for a non-sticky mess when cutting marshmallows; Stand your knife/scissors in hot water for a while before cutting. Dry utensil and cut. Will slide through with no stickiness. May have to restand utensil in water again after about 2/3 marshmallows but it does work
pointy, could your mum get me some next time please as M&S are hiding them from me. . Thanks for the tip biscuits, I will revert to this method if the great mini-marshmallow hunt continues to be a great big failure.