London Information are top notch, they've been very helpful to me several times, including once when my engine started to play up eight miles out over the Irish Sea, which turned out to be a non event, but you don't know that at the moment it happens!
The squawk you get is 1177 and you can get all kinds of useful information from them, including the winner of the men's singles at Wimbledon, which I heard passed to the Red Arrows when on the way home from Le Touquet last Summer.
I've never been far enough North to use Scottish Information. I have this picture in my head of Gregor Fisher and the Outer Hebridies Broadcasting Corporation. I'm sure it's not really like that.