Qualifying matches at Wimbledon were suspended on Wednesday as the automated line-calling system malfunctioned amid record-breaking heat, marking the hottest June day since temperature records began. The stoppage took place at the courts in Roehampton shortly after midday when officials determined that chair umpires could no longer reliably make line calls without technological assistance.

The Met Office reported temperatures reaching 36.1°C in Gosport, Hampshire, surpassing the previous June record of 35.6°C set in 1976. This marks the highest June temperature recorded in the United Kingdom since records commenced in 1884. In response to the extreme heat, the Met Office issued a rare red weather warning covering much of southern and central England and Wales, with amber warnings extending into the weekend.

The intense temperatures have raised concerns over public health and workplace safety. London Mayor Sir Sadiq Khan called for enforceable maximum working temperatures in offices and schools, urging employers and heads of educational institutions to protect children and workers during heatwaves. While the mayor emphasized the importance of protecting vulnerable populations, he acknowledged he lacks the authority to implement legally binding limits.

The heatwave’s impact on transport was notable, with travel into central London decreasing by 12 percent compared to the previous week’s figures. Amid widespread discomfort, a video of a London bus driver critiquing the absence of air conditioning in his vehicle circulated widely on social media. Transport for London stated that all bus driver cabs are equipped with cooling systems and that staff are permitted to take welfare breaks as needed.

Heat-related disruptions extended across multiple sectors. Supermarket refrigeration units failed throughout the country, MRI scanners ceased operating at Norfolk’s largest hospital, solar panels overheated, and several water parks temporarily closed. The rail network experienced significant setbacks as heat caused tracks to expand and overhead wires to sag, prompting warnings for passengers to avoid travel unless essential. Approximately nine percent of trains were either canceled or delayed by more than 30 minutes, according to transport data. Additionally, a serious crash on the M25 led to a six-mile traffic jam due to a section closure.

Environmental and political voices called for increased adaptation to rising temperatures. Green Party leader Zack Polanski advocated for comprehensive “heatproofing” of homes and the installation of cooling infrastructure in schools, hospitals, and care homes, highlighting the vulnerability of children and workers to heat stress.

On the energy front, solar power provided roughly half of the United Kingdom’s daytime electricity demand, allowing the country to export surplus power to Europe. However, as daylight waned and demand increased in the evening, combined with some gas plants going offline, the UK began importing electricity, prompting the National Energy System Operator to issue a power supply warning.

Animal welfare organizations, such as the RSPCA, advised pet owners to avoid walking dogs during the heatwave, stressing that there is no sufficiently cool time of day for such activities. Meanwhile, emergency services were conducting marine searches for a 15-year-old boy reported missing after swimming in Testwood Lakes near Southampton, with the incident reported around 1:35 p.m. on Wednesday.