During the Normandy landings of D-Day, the Brits were still using the Lee-Enfield Mark 4 No. 1 303 British cartridge with ten round magazine. Differing slightly from earlier iterations the 303 was not only used from the Boer wars, through WWI and WWII but up through the Korean war.
The Bren Gun is possibly one of the best squad automatic weapons fielded in WWII. Firing 480-540 rounds per minute and fed via a thirty-round magazine. A 7.62 NATO version was used as late as the Falklands War of 1982. It weighed in at 22 lbs with bipod.
Vickers Machine Gun
The Vickers machine gun adopted in 1912 was the primary British heavy machine gun. A modified Maxim, it was chambered in 303 British. At forty pounds this water-cooled weapon punched out about 450 rounds per minute. Brits hung on to this weapon until 1968. Very reliable it could chew through thousands of rounds with no stoppages.
Nothing is more iconic of the British commando and his Sten Gun. A 9mm submachine gun the Sten was another of the guns made from stamped steel parts or tubing. The latest model, the Model 6 only required 5.5 manhours to make. Royal Ordinance churned out twenty thousand a week and production went to four million for all versions. Weight was 8.5 lbs. and fired at 540 rounds per minute.
Browning Hi Power 9mm
The Brits used the Browning High 9mm or also known as the P-35. Fed by a 13 round magazine it was another brainchild of John M Browning and considered an improved 1911. The other sidearm was the Webley No. 1 Mark 6 a .455 caliber break top revolver. The No. 2 Mark 1 was made in .38 caliber, with about 105,000 made during the war.
The Brits because of the shear magnitude of arming and gearing up for war turned to the US for arms. Many British soldiers found themselves are with American weapons. The Thompson was popular, and many carried a 1911.