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In page Gordon Riots:

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The events at the Bank of England started a tradition where a detachment of soldiers, usually from the Brigade of Guards, would march to the bank to perform security duties. Until 1963 the duty was performed by the Guards in Home Service Dress with bearskin, though tennis shoes were worn inside the bank.[citation needed] From that date until 31 March 1973 the detachment became more functional than ceremonial, doing their duties in service dress with automatic weapons.[6]