Legal cases in the UK have been disrupted as courts have become ‘unusable’ in the third heatwave of the summer.The UK entered its third heatwave in as many months on Monday, with warning of disruption to many walks of life. South-east England officially met the heatwave criteria on Monday evening, after three days of temperatures above 28C, the Met Office said.Temperatures are set to continue to rise across the UK throughout the week, and more regions are likely to reach their local heatwave thresholds, the forecaster added.Parts of southern England could see temperature highs of about 33C on Wednesday and 34C on Thursday, with the highest readings of 35C forecast for isolated areas on Friday and Saturday.While southern areas are already feeling the sun and the heat, a north-south divide w