Watching you watching me

Don't know if anyone spotted the dark patch on yesterday's blip but spent a bit of time today trying to work out whether it was the lens or the camera. My other lenses seem to be OK but even after cleaning the lens in question the mark still appears and is particularly obvious on a pale sky.
Returning from our late night stroll I spotted this gin palace on the loch. Clearly they've heard about our collection! I'm sure there's a story to be told which I'll tell you if they pop in for a drink or to replenish their stock.