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The English Electric P.10 offered to Specification R.156T issued in October 1954 to meet Operational Requirement OR.330 for a Mach 2.5+ reconnaissance aircraft with a range of 5,000nm.
The P.10 was designed to cruise at 70,000ft at Mach 3, it was powered by a ducted ramjet wing boosted by two Rolls-Royce RB.123 turbojets used for take-off and subsonic cruise on the return flight. At the cruise at 70,000ft the ramjets would only produce 1/4 of their maximum thrust to allow plenty in hand for evasive manoeuvres. Ceiling was 85,000ft, range 5,000nm. Jettisonable wingtip tanks could also be fitted (the inset views).
The reconnaissance equipment was the Ku-band Red Drover SLAR with 30ft-long aerials and a camera ahead of the cockpit. Doppler navigation radar was also fitted. The 2-man cockpit was novel in that the pilot's ejection seat slid up and down on rails - EE felt that a pilot would have little to do during the high-Mach cruise on autopilot so he would lower his seat and act as a second observer, the instrument panel tilting.
The design lost out to the Avro 730, though the Air Ministry were impressed with the propulsion concept. OR.330 was cancelled in 1957 and with it the Avro 730.