It is 72 Sqn RAF "Basutoland" Sqn, so named for the Basutoland protectorate which donated aircraft to Britain through both World Wars.
The pilot F/O Desmond FB "Des" Sheen. On 5 Sep 1940, when wounded, managed to exit Spitfire Mk I RN-J while hurtling towards the ground. Sucked out of the cockpit, the 22-year-old Australian found his boots caught on the windscreen and left lying on top of the fuselage. On pulling the ripcord and landing in trees, he was greeted with "You left it a bit late" and handed a flask by a policeman on a bicycle.