As the mercury crept up, the Daily Mail's Senior Science & Technology Reporter, Wiliam Hunter, set out on some of the popular Underground lines and bus routes, armed with a thermometer.

As the mercury crept up, the Daily Mail's Senior Science & Technology Reporter, Wiliam Hunter, set out on some of the popular Underground lines and bus routes, armed with a…

‘There are limits, and this is pushing it,’ one Londoner told The Independent