The British might not have had enough firepower in their ground forces, perhaps. In the pre and mid WWII times, they had developed new armor-piercing shots that were capable of penetrating well armored vehicles. However, the biggest downside to them is the fact that they barely contained shrapnel or other explosives, resulting in them having to resort to using smaller, fast firing guns in order to knock out the enemy crew members one by one. In the post-war era, they were known for the high explosive squash head shells that could be fired from 105mm guns up to 183mm cannons. Their air force and naval fleet were powerful. They liked using small caliber guns, but made up for it by increasing the firepower with more guns, hence the meme "just add more gun".
Some pretty useful/reliable vehicles that were created by the British during World War II are:
- Spitfire Mk. IC
- Crusader 57mm/OQF
- Cromwell Mk. V
- Centurion I
- Hurricane Trop/Mk. IIB
