The QCS

The Queen's Colour Squadron are the ceremonial squadron of the RAF Regiment, and are (allegedly) the RAF's equivalent of the QGR. Actually, they aren't really. They are, however, a bunch of Tick Tocks who march up and down the Albert Hall in silence - and they're quite good at it too. Well... you would be if that's all you did all day - march up and down the square. That said, they do have a war role as such, and do their stint in green before reverting to their non-war role of marching up and down the square and piano lessons.

See here for more information on their lesser known role of battlefield (or indeed airfield) smokescreen production.