Typhoon Mk IA was introduced with 12@50-cal (7.7mm) heavy machine guns, similar to Hurricane fighters. But for ground attack role, British upgraded armaments to 4@20mm Hispano cannons in Mk IB version for harder hitting power. Main difference is that heavy machine guns fired lead slugs, but cannons fired explosive munitions. Hispano-Suiza HS.404 cannon - en.wikipedia.org/wiki/Hispano_20mm_cannon

Rollover : Tiffy side view, black-white stripes at fuselage bottom came from decal sheet. British Sky-color fuselage band was standard RAF theater identification and to avoid friendly-fire incidents. Friendly Fire - en.wikipedia.org/wiki/Friendly_fire