What measures should Employers be taking in the current heatwave to ensure their workforce can operate safely on sites?

With the current heatwave in the UK expected to reach a new peak on Monday and Tuesday what changes and special measures should employers and site operatives be taking to enable work to continue safely?
The following link will take you to an article by CIOB’s Construction Management publication which provides some useful tips and recommendations but i am sure there is far more which can be and will be done.
Please share your good initiatives here on Construo for the safety of all workers.
https://constructionmanagement.co.uk/are-contractors-obliged-stop-work-during-heatwaves/