Question: The Queen Alexandra Memorial on Marlborough Road, London, which commemorates Queen Alexandra of Denmark, consists of a bronze screen incorporating allegorical figures, set into the garden wall of Marlborough House,  a Grade I listed mansion in St James's, City of Westminster, Inner London, is the headquarters of which organization?
Sentence (from "Queen Alexandra's Memorial Ode"): Queen Alexandra's Memorial Ode is an ode "So many true Princesses who have gone" written by John Masefield and set to music for choir and orchestra by Sir Edward Elgar for the occasion of the unveiling of Sir Alfred Gilbert's memorial to Queen Alexandra on 8 June 1932 outside Marlborough House in London.
Relevant evidence: No