IWM caption : Vickers Wellington Mark ICs of No. 37 Squadron RAF, being prepared for a raid at an Advanced Landing Ground in the Western Desert, probably LG 09/Bir Koraiyim, during bombing operations against Italian ports and airfields in Libya. Groundcrew are about to refuel T2508 'LF-O', which has just had its port mainwheel replaced after bursting a tyre on landing.