The most updated NSPCC guidance for child protection in England is available here

Hot weather and health: guidance and advice

Looking after children and those in early years settings before and during hot weather: teachers and other educational professionals - GOV.UK (www.gov.uk)

This is part of the suite of documents that support sectors to plan for and take action during hot weather.  Children are identified as one of the more vulnerable groups and can be at risk from hot weather because of their physiology, behaviours and activity levels. Children potentially at greater risk include those aged under 4 years, those with health conditions or taking certain medications.

Adverse Weather and Health Plan - GOV.UK (www.gov.uk)

Hot weather and health: guidance and advice - GOV.UK (www.gov.uk)