When the Southern ATCC was in the square building on the north side of Heathrow many moons ago it had "Southern Air Traffic Control Centre" on the side in large letters. When it was being refurbished the workmen took down the letters, but it wasn't long before some ATCOs reinstalled some of them to read "Lens Cafe". Apparently there was a certain amount of confusion next morning when the incoming watch found the car park full of juggernauts..
That's the basic tale as I heard it.....