Substitute double cream for butter? I have a lot of leftover double cream and I was wondering if I could substitute it instead of butter in a biscuit recipe? I know it's a different consistency, so there would have to be some calculations on it - but has anyone done it? Can anyone offer any advice! 

I was also thinking I could use it in a butter cream filling? Or would that not be possible? 

Any advice welcome!
You can't really substitute double cream for butter as the fat/water ratio is different - it's basically just too wet. However, guess what they make butter out of - cream! If you 'over whip' cream, the fat separates from the liquid leaving you with fresh butter. Naturally this is easy if you have an electric mixer. If you're doing it by hand, prepare to be tired.