Tim, the gun serialed in the 3000 range was marked on the top rib, Hollis Bentley & Playfair, London. The serial no. was on the trigger guard, barrel underside and receiver. See below.
The gun in the 88,000 range was serial no. marked on the under rib only. The top rib was marked Hollis Bentley & Playfair, Birmingham and London, all in gold. See below.
My thought was that both guns were made between 1911 and the war. I also "guessed" that the high number was a Birmingham number and the 3000 range number may have been a London number.
