ShyTorque, the answer was indeed not enough Mk2s to go round. They were replaced when 18 gave them up for Chinooks. 84 initially had Mk2s to replace the Whirlwind as they were flown out in Nov 81 from Benson when 72 moved to NI. These were eventually replaced by the converted Mk5 and the Mk2s returned to bolster both 72, post Falklands as the Navy had pulled out of Ireland and the SAR fleet. When 72 first moved totally to Ireland we only had 12 cabs but after we started to build again we had a full alphabet + 2 more ex 18 cabs.