The Script singer Danny O’Donoghue wore a red suit during the heatwave during and praised fans at the Glasgow Green festival.

The third heatwave of the summer is set to peak on Saturday, forecasters said, with highs of more than 34C possible in parts of the UK.

A Wimbledon finalist has questioned why the tennis tournament will not close its roof, after sweltering conditions left Centre Court spectators needing medical assistance.