To give you some context, it’s illegal to transport livestock at temperatures over 30C.

Things weren’t much better above ground – those taking the bus were subjected to 35.5C heat.

People have taken to Twitter to voice their despair over the heat. ‘I have spoken, it is far far far too hot on London Underground’ said @beautykingUK. ‘Descending into the London Underground is like descending into hell. Except hell isn’t quite as hot and hell’s people are more pleasant,’ reported @mmadz9.

If you’re using the Tube today, please don’t get on if you feel unwell, or if you start to feel poorly, wait until the next stop if you can – don’t pull the emergency cord and ensure you all get trapped in the tunnel! Take plenty of cold water with you and wear layers.

Image credit: Getty