Titles & Address Etiquette in United Kingdom

Use Mr, Mrs, Ms, Dr, or other professional titles and surnames until invited to use first names, especially in formal settings, business, or when meeting someone older or in authority. In everyday British life people often move to first names fairly quickly, but in the first exchange it is still polite to be slightly formal and to avoid overusing honorifics like Sir or Madam unless you are addressing staff or making a very formal request.