Can a girl become prime minister in the UK?

In the UK most people could stand to be elected to parliament. The leader of the largest political party is generally the Prime Minister - this may not be true if there is no overall control and a coalition of smaller parties puts one of their own members into that position.

However, Catholics may not, at present , be the Prime Minister of Great Britain. When Tony Blair was talking about becoming a Catholic, like his wife Cherie, there was discussion of changing this law, but he waited until after he left office before changing his religious affiliations.