The L42A1 was the very last of the British Lee Enfield rifles and it was developed in the late 1960s to replace the No. 4 Mk1 (T) rifles of the WWII era.
ARES L42A1 Spring Bolt Action Airsoft Rifle w/ Scope & Mount - Hero Outdoors
Deactivated Lee Enfield no.4 t Sniper Rifle
The L42A1: Last Lee-Enfield Sniper Rifle!
History Of Britain's L42A1 Sniper Rifle: Full Review - RifleShooter
Milsurps Knowledge Library - From No4 Mk I (T) to L42 AI - Part 2 (by Graeme 'broadarrow303' Barber)
NV097 Vector Optics Lee Enfield No 4 T/L42A1 Scope Mount Review Part 1. Unboxing & first impressions
Milsurps Knowledge Library - 1971 L42A1 Enfield Sniper Rifle
Desirable British Enfield L42a1 Sniper Rifle Rig
Sniper Central U.K. L42A1 SNIPER RIFLE
Historical Firearms — The Evolution of the British Army's Lee-Enfield
The Lee Enfield Rifle
Lee Enfield Showcase: Ares Rifle No.4 MK.I (T) Sniper Rifle
WATCH: British Lee-Enfield No. 4 (T) Sniper Rifle