To add a bit more information, the existence of the Army helicopter TI installation is reported in the RRE Malvern progress report of 71-72. Whatever the equipment was, I don't believe it was installed by the RRE (since no Scout or other Army helicopter visited Pershore for installation in that time period). The RRE did do some work on a helicopter-borne FLIR in same timeframe, cobbled together from an IRLS and a real-time display - that was flown in Puma XW234 in 1973.
Last edited by redsetter; 15th Mar 2020 at 13:29.
Reason: correction