I am trying to make [these "cream biscuits"](http://smittenkitchen.com/blog/2009/12/cream-biscuits/). However, they just will not rise (tried 4 times) and end up looking very flat.

I thought my problem was that I work the dough too much, but I tried it again and didn't touch the dough much but it still doesn't rise. I am using newly bought baking powder.

I am thinking the problem might be one of these reasons:

1. I used **double cream** instead of heavy cream because I am in
the UK and we have single/double but not "heavy cream". (I just
found out heavy cream is whipping cream in the UK)
2. The first batch was made with the full recipe and none of them
 rose, so I experimented by cutting everything by 1/4 and made 2
 biscuits at a time.

Why won't my biscuits rise? Are there any other possibilities?