Just been out in our newly acquired 70 k mile 1.4 petrol with massive service history!and engine management light has come on.Car sounds and runs ok!We have had our 1.4tdi for 15 years without any issues.Serves us right for wanting a car with leather trim,pan roof etc!
Also, if the light is on for a minor fault or one hasn't reoccured, then it is reset after something like 7 starts. It may stay in the ECU history longer though.I've hardly used either of my A2s during the lockdown period.
I've been using my 1.4 petrol once a week at most for our regular food shopping trip, less than 1m round trip (we only take the car as there's too much to carry).
EM light came on around week 2, but car ran fine. In the last few weeks I've had chance to take the car on a few longer drives, and the light has gone off.
Like A2Steve has said it won't be much. Might just be down to less use.