Also forgot to mention, H & H only offered 2 of the 4 calibers available from BSA, who made essentially all of the Lee Speed / Enfield / Metford sporters. The others were 7x57R Mauser & .375 2 1/2" Flanged Nitro Express. There were a number of British "Gunmakers", a lot of whom were actually only retailers of Birmingham's manufactories' products, who offered these rifles for sale. As near as I have been able to determine through resarch, owning and / or "fondling" / shooting them, here is a list. I would, however, appreciate hearing from others who may have some to add to the list.

ARMY & NAVY Co-operative Society Ltd.
Henry Atkin
Frederick Beesley (inventor of the Purdey sidelock)
Bentley & Playfair
BIRMINGHAM SMALL ARMS Co. Ltd.
BSA & M. Co.
John Blanch & Son London
Thomas Bland & Sons
C. G. Bonehill
Charles Boswell
CHURCHILL (GUNMAKERS) Ltd.
Cogswell & Harrison Ltd.
COOMBES COMPANY Ltd.
W.W. Greener Ltd.
HOLLAND & HOLLAND, Limited
I. Hollis
Hollis, Bentley & Playfair
Holloway & Co.
Holloway & Naughton Ltd
W.J. JEFFERY & Co.
Charles Lancaster
Alexander Martin
Charles Osborne & Co. Ltd.
WILLIAM POWELL & SON
J. Rigby
J. Robertson (General Manager of Boss)
Victoria Small Arms Co.
WESTLEY RICHARDS & CO. LTD.
James Woodward
William Moore & Grey

I have owned about a dozen of the rifles by these makers & seen examples by most of the other makers. The H & H rifle I have seen was marked SHOT & REGULATED BY HOLLAND & HOLLAND 98 NEW BOND STREET LONDON

If there is any interest, I could upload some of the photos to share with the members.