The last No. 4 Enfield rifle entered British Army service in 1970. An updated version of the WW2 No. 4 sniper rifle, this last iteration was finally retired in 1985, after service in Oman, Ireland and the Falklands War.
L42A1 picture from Imperial War Museum
The L42A1 was one of the last arms built by Enfield Small Arms Factory before it's closure in 1988. The caliber was updated to .308 (7.62mm) to keep up with Nato ammunition compatibility, and there were about a thousand rifles built. The magazine still kept 10 rounds but the shape was altered slightly. A heavier hammer forged free-floated barrel was used with 4 grooves with a right hand twist. Enfield rifles had always suffered from the barrels being too light, but combat rifles have to make some compromises. The handguard was cut back to the middle barrel band, and the previous sniper butt stock was retained.
No. 32 Scope
The standard No. 32 scope (originally developed for the Bren Gun) was modified to the trajectory of the .308 bullet and became the "Telescope, Straight Sighting, L1A1". Other variants included Parker Hale sights (L39A1) for target shooting, a police version (Enfield Enforcer) and a nicely finished civilian version (Enfield Envoy). These guns are available in the states, it has been estimated that at least half of the thousand guns are over here. Still pretty pricy though, this example on Guns International in somewhat north of $5000.
L42A1 for sale on Guns International