People ‘of a certain age’ may relate to this. I was in a conversation a little while ago with a group of long-standing friends. These are good friends, the type of friends that have passed through a lot in each other’s company. We had got together just to be together and because it had been too long since the last time. We sat in comfortable sofas in a room heated by a newly installed log-burner. The conversation, which I hasten to add I was not a part of at that time, became very animated as my four friends discussed the merits of various dental plans.