Commercial Lee Enfield rifles including those marked with Speed Patent were only made by two companies in the UK. BSA and LSA or London Small Arms.
Any rifle marked Holland & Holland, Purdey, Westley Richards or W.W. Greener were all retailed by these gun making firms, not manufactured by them. The later company did produce parts for the Lee Enfield under military contract in the Great War, but not complete rifles.
Records for BSA are held by Warwick University, but do not appear to hold any sales ledgers of commercial rifle sales. The records for London Small Arms Co are with an institution in Scotland. I don’t know anyone who has looked at these records but again it is unlikely they will have any detailed records. I hope to look at these records myself in a couple of months on my next trip to Blighty.
There is a Facebook page run by an enthusiast for London small Arms Co -
https://www.facebook...rmsCoLtdhistory
An Admiralty history of technical problems published in 1920, has a list of miscellaneous small arms purchased in America and from the British 'trade', which includes the following entry.
303-inch L.E. Sporting Rifles. 970 bought from the trade in March 1915, issued to miscellaneous craft.
Small quantities of Lee Enfield’s which were in stock were purchased by the War Office early in the War one of which was a purchase of 17 rifles from LSA Co. This was reported in the official History of the Ministry of Munitions published after the War, the author missed a second small purchase from the LAC at around the same time, which show up in contract records which was for around 13 or 15 rifles (file not to hand). This goes to show that the researcher cannot take on face value even official history’s without checking the source material.
A book on commercial Lee Enfield’s including "Lee Speeds" is being prepared, hopefully we will see it next year.
There is a sub-forum on Lee Speed rifles on the Nitro Express Forum which is worth checking out.
Does your rifle have any maker or retailer markings?
Regards
AlanD