Agony aunt

Q. I have just returned from a holiday where I was the guest of someone extremely rich. She was emphatic that everything would be covered and I must not even think of bringing a present. However, after one lunch in a restaurant, I felt driven to make a gesture and quietly asked the waiter for the bill. The sum involved was the equivalent of two months’ rent for me, but worse, no one noticed I had paid.  When the time came, everyone just got up to leave and I realised our host has an account with the restaurant, so she would not have noticed either. How, without being vulgar, can

Q. A central London bookshop has kindly invited me to be one of 30 authors signing copies of our books at its Christmas customer evening. I feel it would be rude to say no, so I’ve said yes. But I went to last year’s event at that same shop, and saw the excruciating sight of some of my favourite authors sitting alone and unvisited at their signing tables, while crowds were queueing round the shop for Gyles Brandreth. This would bring back my worst childhood nightmares of not being picked for games teams. What occupation could you recommend to pass the time as I sit there from six till eight,