With Franek's posts very much in mind, I found this fine photo while searching for pictures of a Tannoy. It shows Squadron Leader S. Pietraszjewicz of 315 (Deblinski) Squadron with his Hurricane shortly after the squadron was founded at RAF Acklington, January 1941. In March they moved to Speke to provide fighter cover over Merseyside, and in July they moved south to Northolt and converted to Spitfires to carry out offensive sweeps over northern France. The squadron was disbanded in 1947.