The Hawker Siddeley P.139B was a proposed airborne early warning aircraft intended to operate from aircraft carriers of the Royal Navy. The P.139B formed part of the a major equipment procurement plan for the RN in the 1960s intended to give the service a force of new, modern carriers capable of operating air groups consisting of equally modern aircraft. However, cuts in defence spending by the British Government in the mid-1960s meant that these proposals never came to fruition.
Source: wikipedia
Tony's Domain 
One of the most uggliest designs ever?
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Certainly a contender
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Yes, it’s certainly different. It looks like three or four designers had too much to drink one Friday lunchtime and then spent the rest of the afternoon trying to update the Fairey Gannet.
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It would have had greater coverage than an E-2 had it flown
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A bizarre looking aircraft to say the least! Probably why we’ve never heard of it!
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It was only proposal but had it been reality it would have had greater coverage than the E2
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It looks quite small. Are there any proposed performance figures?
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