[Juha]

Or Hurricane IID, 40 mm Vickers S gun vas very accurate, and its 3 lbs AP shot penetrates 58 mm of armour at 20 deg from 400 yards with A/C speed 350 fps (385 km/h). Did well in North Africa and Burma. But as underpowered plane it was practically defendless against enemy fighters and vulnerable to AAA, British concluded that German Flak in the ETO was much too effective for them and rockets were much more effective aganst soft vehicles and ground troops.
Of course if RAF would have thought that gun armed anti-tank A/C was very important and demanded more Merlin 27s and so made possible more power for Hurricane Mk IVs. But that would have meant less Merlin 25s and so less Mosquitos. And Mossies were deemed more important planes.