Having some work done on my house. Realized a few days before the tiler was due to start work that I hadnt ordered the tiles! Hastily ordered them and told the tiler I’d made an error and they wouldn’t arrive on time. He was due to start on the Monday and they arrived Tuesday morning. He’s had to push his other jobs back to fit me in as he had to start work on my house a day later than planned. He has now asked for an extra £80 to cover the fact he’s got to work the weekend to catch up on his other jobs that have been delayed due to my error and then work an evening to finish my job. Should I pay him this?