Depends on how you look at it. Remember that in UK, there's no concept of separation of powers - the Parliament is sovereign, and the executive (monarch excepted) derives all power from it, inasmuch as the Parliament chooses to grant it. And one of those powers is to set policy for the entire cabinet.

In a sense, UK actually has too much democracy, and too few [formal] checks and balances on the power of the elected legislature.