If I recall correctly from reading the Staines AIB report, Captain was assumed to be PF and the wire FDR readout indicated that several attempts were made to fly the anticipated pitch attitude for flap retraction but this produced a descent due to the LE devices being retracted which the crew would not have expected and a higher than normal attitude was adopted to maintain at least level flight which resulted in a loss of airspeed. PF was clearly confused but not incapacitated, normal SOP would require PF to call for PM to retract TE/LE devices.