- 8 updates
How long can a 99 ice cream last in this year's heatwave? The popular summer treat was put to the test in central London.
- Network Rail is warning track temperatures could be 20 degrees higher than air temperatures, raising fears of buckling
- Teams of "watchmen" will be monitoring potential hotspots and may impose temporary speed limits where tracks reach 50C
Rail bosses could be forced to introduce speed restrictions on some train services in London because of the heatwave.
Temperatures in Central London could hit 30C this afternoon, making it the hottest day of the year. Tomorrow will be even warmer.
Parts of London have been warned to brace themselves for potentially dangerous levels of heat amid predictions that temperatures in the capital could be warmer than Hawaii and The Bahamas.
Health officials issued a heatwave alert following forecasts that temperatures may reach 32C (90F) in London on Friday.
Current figures suggest the hottest spots in London also look set to be warmer than European holiday resorts such as Crete (30C) and Ibiza (29C).
With temperatures set to soar, Public Health England (PHE) said that heatwave conditions can have a "significant effect on health".
- The exceptionally hot conditions are expected to start on Thursday evening and continue to Saturday.
- Public Health England says people should consider staying out of the sun during the hottest part of the day, to drink plenty of fluids and wear sun cream that is at least factor 15.
- It has also asked people to be aware of children and the elderly, to ensure they are not suffering because of the heat.
Public Health England has warned this week's heatwave in the South East could have a "significant effect on health".
The Met Office has declared a level 2 heat-health alert. It's activated when there is at least a 60% chance of temperatures being high enough on at least two consecutive days and into the night to have a impact on health.