The US General Grant tank gave British armour a good 75mm HE round for the first time, but the tank had to be in a vulnerable 'hull up' position to use it. The turret mounted 37mm was inadequate against longer ranging German armour by early 1942. CinC General Auchinleck on the back decks.
British Canal Defense Light M3. Canal Defence (Suez Canal,when the Deutsche Afrika Korps was advancing) Light was a light source behind armour that could be focused through a small hole to enable accurate shooting at night.Unfortunately someone suggested thst if the light was flickered rapidly the enemy would be blinded and not be able to shoot back accurately.A security blanket descended and the Tank Regimennts never heard of it .