How expensive is London in the summer?

"The city is a killer in the summer, you spend so much." London workers told City A.M. they spend between 15 - 50% more in the summer. #costofliving #london #uk #personalfinance #spending #budgeting #howmuchispendinaday #city #londonspending #expenses #streetinterviews #voxpop #howmuchdoyouspend #food #transport #rent #saving #summer #londonsummer #heatwave #holidays #goingout #londontok