It’s a Contact Light fitting. These were used primarily in connection with radio landing aids in poor visibility. Their function was to indicate to pilots the limits of the runway, once the aircraft had been guided by radio to the point where the aircraft could be let down onto the runway. They were normally fitted only on the main runway as in fog there is usually little or no wind. (Not in places like Cornwall, though!) The airfield memorial at Cheddington has one of these fittings as part of the design.
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