When should I call 999 for a child affected by heat?

UKHSA's guidance:

• Suspected heatstroke: call 999, then cool the child down while you wait for help. Heatstroke is a medical emergency and can be fatal.
• A child loses consciousness or has a fit: put them in the recovery position, call 999 immediately and follow the call handler's instructions.

Signs that point to heatstroke rather than heat exhaustion include confusion or lack of co-ordination, a seizure, loss of consciousness, a body temperature of 40°C or above, red hot skin (sweaty or dry), a fast heartbeat and fast, shallow breathing.

For heat exhaustion that is getting worse, or if you are worried, get medical advice from NHS 111.