Good morning all.
Due to extreme personal circumstances, this is the first chance I have had to reply to your helpful messages.
The most compatible reply was from Bobbins. I, too, tried everything I was supposed to do. After having booked the Audi A4 into the garage to have it checked out, it suddenly rectified itself after five weeks of not allowing me to check the oil level.
Perhaps it was a computer blip. It is a complete mystery to me.
Thank you for your time.