Call the bank and register it lost and they'll cancel it and send a new one out but until it arrives you can go into the bank with ID and withdraw money
Cancel the card immediately- phone up your bank - mine give me a special code so you can withdraw money or go to the bank and they may let you withdraw some there and then
Which bank are you with - if it's NATWEST you can get a code through the app so you can withdraw money without a card
Well it's my mums account I use.. I checked the bank last night around 2am after leaving my dad's.. I didn't realise it was missing until my brother wanted to borrow £20 1pm this afternoon