This regiment continued with its existing numbering series when it was formed out of the Imperial Yeomanry in April 1908. The regiment formed part of the London Mounted Brigade which was administered from the Duke of York's Headquarters in Chelsea. The regiment itself was headquartered in Finsbury Square and recruited for all four squadrons from Finsbury Square.
1424 joined on 29th June 1908
1705 joined on March 11th 1910
1963 joined on 21st June 1912
2061 joined on 14th February 1913
2153 joined on 18th February 1914
2183 joined on 6th April 1914
2406 joined on 3rd September 1914
2744 joined on 19th October 1914
2778 joined on 6th November 1914
1849 joined on 15th December 1914
A 2/1st unit was formed in August 1914 and 3/1st unit in 1915. Both these second and third line units shared their number sequence with the 1/1st.
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