Will try that, thanks @calwoo
I do however have the R40 firmware. The top bar shows 'Off/ACC/TJA' setting and not the 'Mode' selection underneath. Will try during my lunchbreak if it's there when I turn it off though.
Pretty brilliant. Just received my MG4 Trophy yesterday (the newest one, with rear wiper and R40 as software) and yeah, I wouldn't have thought of this to find the pre-heat function.
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