This is a Lee-Enfield No.4 Mk1/2 (F) FTR model. The Mk1/2 has been changed from a Mk1 to a Mk2 and differs from the usual No.4 rifle with a minor
Lee–Enfield - Wikipedia
A 1943 Lee Enfield Rifle No4 Mk1 Rifle As Used in WW2 Deactivated - Sally Antiques
At Auction: WWII Enfield No.4 Mk1/2 .303 British Bolt Action Rifle 1945
Navy Arms #4 Mark 1 Enfield Rifle - Now Available
GUNS Magazine Number 4 Lee-Enfield Rifle - GUNS Magazine
Lee Enfield No.4 Mark I* 1950 – NT Rifle
Navy Arms #4 Mark 1 Enfield Rifle - Now Available
Lee Enfield Rifle No1 Mkiii* # 46762
Lee Enfield Manual, PDF, Cartridge (Firearms)