I got asked what time should people be closing the shop, as I was not too sure, I decided to see what others are doing last night.
After looking at a few shops, I decided that this sign looked fair and reasonable. Also, they are a big company, so I am sure they have checked it out.
So this would be our recommendation.
The shop starts its closing down procedures at 7:30 PM, so the public has a 15-minute window to finish off their purchases as the tills get shut down at 7:45 PM.