Peter, by the size of the pod, it would have to be a fifth engine. Never seen one enclosed like the one in the photo. The other interesting thing is that these must be early model B707's as they are fitted with noise suppressors which indicates there were turbojets as distinct from turbofans. If I remember correctly the later BOAC B707s were powered by RR Conways Turbofans (same as the VC10s) and those noisy blighter's would shake the fillings from your teeth.
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Cheers,
Noel White
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