One thing I could never fathom and neither could some of our avionics engineers was our Sengo / Jengo’s insistence to run the NavWass etc at Deci with the Avionics bay door open “for cooling” thus destroying the effectiveness of the built in cooling system by destroying the flow through the boxes. Never could understand the logic behind that.
i do have a picture somewhere of the spotty Jag fitted with the Adour 821 engine…