The Duke of Gloucester attended a Service at the Priory Church of St. John

The Duke of Gloucester, Grand Prior, the Most Venerable Order of the Hospital of St. John of Jerusalem, this morning attended a Service at the Priory Church of St. John,
Clerkenwell, London EC1, to commemorate the Centenary of the Bombing of the St. John Ambulance Brigade Hospital at Étaples and was received by Her Majesty’s Lord-Lieutenant of Greater London (Sir Kenneth Olisa).

Sourced from the Court Circular

Photo sourced from https://www.royal.uk/the-duke-of-gloucester