I have mentioned "Yes Minister" and "Yes Prime Minister" a few times in this blog (for example see here). It is one of my favourite TV comedies - and alsoI rate it highly as a tongue-in-cheek guide to the workings of British government. Many of the the episodes and incidents were grounded in real events and practices.
The writers have recently started a blog in "Sir Humphrey's" name - although he should be retired now (a little like Bart Simpson, time has no effect).
I thoroughly recommend signing up for this blog. The link is here.
An explanation of Foreign Policy from the original series