NURSE, it was slighty before my time, but from some I know who were there, the high temperatures caused major problems with aircraft that were already performance-limited even in ISA conditions.
My favourite story (possibly achrophal) from those days was of the number of hits from ground fire the Brit choppers were suffering in the tail rotor area. Then some bright spark came up with the novel idea of moving the large RAF roundel that was painted under the forward cabin to right down towards the back end of the tail boom.
The Indon marksmen on the ground had been (naturally) drawn to aiming at the large, inviting 'target', and, with that providing the lead angle, the choppers were taking hits near the tail.
Roundel moved, same (lack of) lead angle applied, no more hits. British ingenuity at its best.