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1. Wide of retirement home care manager Cathy Dyer and pensioner Denis Aston in living room of home, she shows him thermometer
2. Mid of Aston
3. SOUNDBITE (English) Cathy Dyer, care manager at retirement home:
"Constantly thinking about them, yes, especially the very vulnerable people. And, you know, have they got everything they need, is it cool enough in their homes. And there are instances of people who have to go in the hospital because they are overheating, they are dehydrating."
4. Wide of old people in retirement home
5. Mid of old woman
6. SOUNDBITE (English) resident of retirement home (no name given):
"Very, very hot. It is very hot out, isn't it?"
7. SOUNDBITE (English) resident of retirement home (no name given):
"Well, it's pretty tough, it's pretty tough at times."
8. Pan of retirement home worker to woman in wheelchair in room
9. Wide exterior of Watford Hospital, entrance to Accident and Emergency department
10. Mid of people walking outside hospital entrance ambulances parked outside
11. SOUNDBITE (English) Jackie Idley, works at Watford General Hospital:
"In our Accident and Emergency we've been seeing between 30 to 50 extra patients, in our A&E, linked with the heatwaves, that's been linked with dehydration and heat exhaustion. On the other end, in terms of people we are discharging home, to their home, we actually consider each individual and look at how vulnerable they are."
Officials in England issued heatwave health warnings on Wednesday, after temperatures soared above 30 degrees Centigrade for five consecutive days, in the country's first heatwave in seven years.
The UK's national weather service, the Meteorological Office, issued a Level 3 Heat Health Watch for London and Southeast England.
An average Level 3 threshold temperature is 30 degrees Centigrade by day and 15 degrees Centigrade overnight.
Forecasters have warned that the heatwave can pose a danger for the vulnerable - the very young, the very old and those with chronic diseases.
At a retirement home in St Albans residents and staff are struggling to deal with the heat.
"There are instances of people who have to go in the hospital because they are overheating, they are dehydrating," said Cathy Dyer, care manager for the retirement home.
A resident at the home added "it's pretty tough, it's pretty tough at times."
Hospitals around the country are on alert for an increase in heat related incidents and illnesses.
"In our Accident and Emergency we've been seeing between thirty to fifty extra patients in our A&E, linked with the heatwaves, that's been linked with dehydration and heat exhaustion," said Jackie Idley, who works at Watford Hospital.
Officials have advised people to be aware of the possible health effects of hot weather and take the necessary measures to avoid physical exertion and overheating.
Many other parts of the country remain at a Level 2 Heat Health Watch, with the North and North West of England escaping the heat.