The Vice President says that all of the UK's nuclear weapons are stored in one place--a fictitious naval base called Creegan. In fact, at least four different locations in the UK store its nuclear warheads.
The Vice President mentions a UK submarine base in Scotland at a place called Creegan. The Royal Navy's sub base in Scotland is at Gare Loch. This is not a secret, so there is no reason to make up a fictional base.