Update on the original post:
Having checked the oil level on a perfectly flat surface, engine cold, it is at but not over the upper marker on the dipstick. Next drive the warning light and message had gone. I spoke to the dealer and a technician said it was ok to drive, oil change due in 2,700 miles.
Next, I took the car out for an 80 mile mid-evening sports mode Italian tune-up
Any more warnings I will get the oil change sooner. In truth the car will be changed for a petrol hybrid in a couple of years, perhaps another Karoq if they finally launch one, if not a Sportage or Tucson, so ultimate longevity of this diesel engine is not my greatest concern. The only reason I bought a diesel again was because it was the only sensible 4x4 option, needed because of a hilly home location and elderly dependents who need us whatever the weather.