We saw this today, and just couldn't figure out how they managed it. Weather was ace, and yesterday was calm also. They seemed fairly relaxed about the whole thing - when we approached there was a lady knitting away quite happy on one of the yachts. Maybe they reckon its a cheap way to clean the hull and apply a bit more anti-fouling. Find out tomorrow if they are sat the opposite way over
Was great weather on the clyde for sure!