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 also headquartered in Chelsea and recruited for all four squadrons from Chelsea
2254 joined on 7th April 1908
2713 joined on 18th February 1910
2912 joined on 6th March 1911
3004 joined on 10th January 1912
3166 joined on 31st March 1913
3296 joined on 23rd March 1914
3324 joined on 11th August 1914
3541 joined on 15th September 1914
A 2/1st unit was formed in September 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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