[1] The building was designed by Edmund Scott as the headquarters of the 1st Volunteer Battalion, The Royal Sussex Regiment and was completed in 1890.

[2] This unit evolved to become the 6th (Cyclist) Battalion, The Royal Sussex Regiment but moved to Montpelier Place in Brighton before the First World War.

[3] Meanwhile, the Sussex Imperial Yeomanry had been located at the Church Street drill hall from their re-formation in 1901.

[4][5] The regiment was mobilised at the drill hall in August 1914 before being deployed to Gallipoli and, ultimately, to the Western Front.

[4] After the defence cut-backs of 1967, the drill hall was decommissioned and became a Royal Mail sorting office.