[kaki3152]

Thanks to all for their observations, especially Graham for his detailed explanation. I assumed the Hurricane was in the Desert, but it could very well be in Greece. Different Air Forces have used polka dot camouflage, including the Japanese Army Air Force which had various Ki-43s with all kinds of interesting camouflage.
I guess the idea that this type of camouflage would reduce head on visibility is similar to the Luftwaffe's use of the striped nose on its fighter in the latter part of 1944.