The term 'British Mail' can be broken down into two crossword solutions: ARMOUR (6 letters) and POST (4 letters). ARMOUR is a type of protective clothing or covering, often made of metal, that was historically used to protect soldiers in battle. POST is a system of delivering mail, parcels, and other items from one place to another. In the context of British Mail, it refers to the Royal Mail, which is the postal service of the United Kingdom.