Rule 18 of 20 of no no’s when visiting a Restaurant: Equally bad is the arrogant, indignant loudmouth who simply will not stop battering other people with his point of view, no matter how hard they try to change the subject to something less contentious. It is just remotely conceivable that your correspondent may have very occasionally been guilty of this sin. Some subjects traditionally banned at English dinner tables, such as sex and politics, are in fact the very stuff of lively debate. There are, however, more contemporary no-go areas. For example: politics!