Not ours this time, but spotted in the 'area' (the front courtyard) of a New Town basement flat. Any guesses as to what it is? The curve of the red roof line maybe gives a clue? I'll post the answer in due course, but I'm sure it's not that hard.
Edited to say that I should have been more specific - I meant the red thing! The blue flower is a campanula that is something of a weed in Edinburgh, and particularly in nooks and crannies in the New Town.