It's probably because they've changed the oil and the car thinks there is a problem because it's been emptied. As others have said do check the oil level before going anywhere.
To reset the alert press the menu button on the left indicator stalk then scroll through until the oil light symbol shows. Scrolling is either by toggling the up and down arrows on the stalk or pressing menu again (depends on which Vauxhall you've got).
Press and hold the reset button on the end of the stalk and it should bleep and reset.
If the alert goes out but comes on again when you start the engine then you have a problem
Oooops , apparently just a count down to next oil change which is normally hidden and alerts you when it reaches 10 % , as it originally was on the drive back. (I did check the oil before setting off , new and full). The bloke originally answering the phone last night , and having the keys off me this morning , didn't know that either. Said to leave it there and come back in a bit....
They just pressed something and it went back to normal , but at least took advantage of free parking smack bang in the centre of the city for 3+ hours while we left it there , went off and had a nice morning out getting breakfast and a good look around the shops.
Nice brekkie out (Sssssh! Don't tell hubby I'd already had porridge and a Jam doughnut before setting off ...it's very rare he wants to eat out so wasn't going to say no when he suggested it
)
Lots of money spent choosing my xmas pressies off hubby which I actually liked myself and not the hideous expensive things he kept telling me to try on and trying to secretly tell the assistant to bag up and hide from me (Luckily nothing gets past hawk-eye / big ears me
) .
He was about to buy me some right granny looking tops , one that made me look like a rugby player, and a long black dress/jumper type thing that made me look like dracula
Nice morning out in the end!