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 at St John's Wood, London.
203 joined on 17th April 1908
551 joined on 24th September 1909
617 joined on 29th April 1910
701 joined on 31st March 1911
783 joined on 29th March 1912
952 joined on 27th June 1913
1067 joined on 5th August 1914
A 2/3rd unit was formed in August 1914 and 3/3rd unit in April 1915. Both these second and third line units shared their number sequence with the 1/3rd.
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