Mike is correct. I checked my copy of British patents for small arms. During this period, a patent number was associated with the year it was granted, so the proper notation is 65-2488. A simple number like 1011 is a "use number". Essentially it refers back to the legal contract to use the patent. To my knowledge is no central repository for use numbers.
Metford held 2 additional patents in the US.
For a Projectile. He held this with Henry St John Halford
Patent number: 406728
Filing date: May 5, 1888
Issue date: Jul 9, 1889
http://www.google.com/patents?id=gTBbAAA...ord&f=falseImprovement in Breech Loading Fire Arms
JOHN FABQUHARSON, OF BLAIRGOWEIE, NOETH BRITAIN, ASSIGNOB TO GEOBGE GIBBS, THOMAS PITT, AND WILLIAM ELLIS METFORD, OF BRISTOL, ENGLAND.
Patent number: 193759
Filing date: Jun 28, 1877
Issue date: Jul 31, 1877
http://www.google.com/patents?id=6JZtAAA...ord&f=falsePete