That's like Great Britain as opposed to Lesser Britain. The main island containing England , Scotland and, most importantly, Wales and all the 1000 or so little islands.
It doesn't mean that they are the best but it means that they are bigger. They might be the best but I don't know because I don't live in Manchester so I can't tell you.
Anyway, what I was going to tell you was that GMP have posted a great (meaning simply the best) picture on their Flickr page.
They are girls apparently but don't mind being called guys.
Thank you GMP and Merry Christmas girls!