Right Honourable is a form of address used within the House of Commons, for members of the Privy Council. Members of the person's own party will refer to him as 'My Right Honourable Friend, the member for [constituency]'. Members of other parties will refer to him as 'The Right Honourable Gentleman, the member for [constituency]'. The Privy Council consists of, among others, Cabinet ministers and a number of junior ministers as well as former office holders.
contributed by user Luca Marchiori