Went out for a meal last week. Split the bill with a friend. Her credit card transaction got declined although we had left the restaurant in a hurry to catch our train so didn't know until I noticed they had charged me twice on my card to make up for hers being declined.
I had used contactless to pay for my share of the bill but mist certainly had not agreed for it to be used for her share.
There's no issue with me getting the money from her but can restaurants actually do this (their defence was that the table bill needed paying no matter what).