Originally Posted by Whirlybird
I hesitate to say too much, or this thread will turn into yet another discussion of carb icing. And if you ask ten pilots about use of carb heat, you'll probably get eleven opinions at least. However, basically you can get carb ice in almost any weather conditions in the UK, and almost any power setting.
Arguably correct, but the thread starter flies in Australia (WA IIRC), not the UK.
With +32C and humid it is possible but unlikely to have been carb ice, and much more likely to be what Pilot DAR suggested, or perhaps even plug(s) fouling as your FI suggested.
Have you been taught to lean the mixture at all when the ambient temps
and humidity are high?