SKODA, fabia, 1.4 automatic. VGC. Had full service two weeks ago inc. test drive by trusted garage. No issues found. Asked them to check out heater as seemed to be behaving erratically. Said No problems found. Probably slow to warm up in extreme cold. On long drive last week, AC not working correctly. Heating but not cooling. On same drive hit heavy fog at night on bendy country road so driving slowly when EPC light came on and car stopped. Waited few minutes, turned back on and revved engine. No EPC light came on and drove 15 miles to destination OK. Two short journeys since no problem. No recurrence. Checked brake lights all working OK. Could slow driving in low gear for long period trigger EPC light on or even AC fault? . Cannot get car into garage until new year.