Obviously this is a serious issue for us. The advice as everybody knows travelling on the tube on a very hot day is do take water with you.
If you are feeling faint, if you're feeling suddenly you're going to be taken ill, don't wait to faint on the tube, get off on to the station platform or concourse where someone will look after you.
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Anyone with information can contact the Celia Hammond Trust in confidence via email on email@example.com or call 020 7474 8811.
A Hamsptead mum who is in jail in Iran has ended a hunger strike after three days.
Their pleas came as charity worker Nazanin Zaghari-Ratcliffe was expected on Wednesday to be in her third day of a hunger strike.