Any clues, anyone?

Spotted this on the bus shelter in Princes Street. How odd! What can it mean?

Up before the Archers and Desert Island Discs today and lots of housework and tidying done. Then off to bookshop for a coffee and a browse. Back to the grind tomorrow so treated myself to a Ruby while watching the Poliakoff on the beeb tonight.....that's a couple of hours of my life I'll never get back!