When I was young I used to tell my father that he did no work at all. After a few comments of this type – he asked me why I thought he did not work when he went off each morning “to work” and came home each evening “from work”.

With the blithe innocence of a four-year-old I responded “Mummy says you sit at a desk all day, well Mummy runs around doing things, so if you are just sitting you cannot be doing anything.”