Hidden away in an exclusive cul-de-sac behind Belgrave Square, this small mews pub was built in 1843 and called the New Grenadier until 1885. Even though the pub is small, the two doors suggest two different class-segmented drinking areas at one time. The two rear rooms are usually reserved for diners. A notice outside states that the licensee is only allowed to serve customers who arrive by taxi or on foot. The sentry box outside is a modern addition.

A haven for its regulars, it has no TVs or music but welcomes visiting Morris dancers. Note the messages from customers written on banknotes from all over the world and stuck on the ceiling! The wood panelled walls are not surprisingly decorated with prints depicting the history of the Grenadier Guards. In spite of its hidden location, this is quite a well-known pub and can become crowded at times.

The food menu includes bar snacks and Sunday roasts. Expect to pay Belgravia prices.

In 2023 the operator became Ineos 123, a company manufacturing the Grenadier Ineos car marque; it is sub-leasing from Greene King. Sir Jim Ratcliffe, the petrochemical tycoon, is a financial backer with a two-thirds stake in Ineos.