Hooray - less rain

We had a fairly dry morning - only a few spots of rain at exactly the time Barry'sDark Sky app had predicted - so enjoyed a short walk. Then Barry loaded up the car for a run to the tip, lucky man, while I popped out for lunch with a friend.
At the end of our pleasant lunch we were interrupted by a man from an adjoining table who preceded to give us his views on Harry's book, the royal family and God. In an attempt to stop his pontifications I excused myself and went to the loo, but he was still at it when I got back. How do you stop people like that?