The time I paid with the wrong money

I've tried to educate myself on the cash here. They use a coin for one and two pound {pound is their currency} notes, instead of a bill. Well a couple weeks ago I was feeling real confident. Anthony and I walked across the street to the spar shop ( like a corner market). We pick up the can of jalapeños that I needed,  and we go to pay. The can was something like £1.50. I had {thought} I had grabbed a five pound note and a two pound coin out of my purse. Just an FYI sales tax is already included so what the sticker says, is the price you pay. Makes shopping on a budget easy to calculate! Anyways, I'm feeling real confident and the cashier says "£1.50 please."  So, I grab my two pound coin hand it to him, thinking I got this! Then, the guy looks at me and says ummm that's two pence(cents), I need more money.  I was so embarrassed. I laughed said sorry and handed over my five pound bill. Needless to say, Anthony didn't let me live that one down. Moral of the story... Double check before you pay.  😜😜