[nl]

"The Government's immigration cap should not affect inter-company transfers for global firms, David Cameron said today."

That's a really good example. He's defending a policy of the current PM and Cabinet. Of course this has been passed by the parliament - that's how the Westminster system works. If parliament stops passing the policies of the cabinet then the government falls.

"The Government" refers to the Prime Minster and his/her Cabinet. It is supported by other parliamentary members of the ruling parties.

Colloquial usage of the phrase "the government" to refer to the civil service, and to ministries etc (eg, "I work in government" or "you'll need government approval to build that there") is common. As soon as politics is involved, though "The Government" refers to those who actually hold power.