Hard to say for sure- might need a few more close photos of the receiver-bolt, magazine etc area- This looks like a SMLE in of course .303 cal- (NBD .311") the British High Command insisted on a magazine cut off- a bit like on our 1903 Springfield 30-Gov't-06 rifles- to prevent their "Tommies' from wasting too many rounds was the fable I heard- Greener may have done some sporterizing post 1919- there were sure a lot of Enfield Mk IV and SMLE pattern rifles to sporterize-
The Enfield is a strong action- crappy two-stage trigger which can be slightly modified-- see Dr. Van Van Zwoll's great book on the BA rifles of the world- he does a great job detailing the various Enfield rifles- and our 1917 pattern WRA started to crank out in .303 -but alas, a bit late.