I was travelling motorway at the time, PI-PINGthe oil light comes on...
I waited the book stated three mins before checking oil and spot on the Min mark

Garage didnt have 0-30w (sigh) so topped up with 5-30w and will be checking it first thing tomorrow morning.
After topping up no oil light again for the remaining 150 miles.
I normally know my oil, I didnt check it recently as its only just been serviced...