BREAKING: Downing Street insists self-isolation is 'crucial'.

Downing Street has insisted that self-isolation rules are 'crucial' as a list of critical workers who may be exempt is expected.

Business Minister Paul Scully had suggested self-isolating when pinged by the app was a matter for individuals and employers to decide, but Downing Street has issued a strong statement to deny this.

A No 10 spokeswoman said: 'Isolation remains the most important action people can take to stop the spread of the virus.'

SUBSCRIBE to our YouTube channel for more videos: www.youtube.com/skynews

Follow us on Twitter: twitter.com/skynews

Like us on Facebook: www.facebook.com/skynews

Follow us on Instagram: www.instagram.com/skynews

For more content go to news.sky.com and download our apps:

Apple: itunes.apple.com/gb/app/sky-news/id316391924?mt=8

Android play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB

Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí www.youtube.com/channel/skynewsespanol

Watch video on channel "Sky News"
BREAKING: Eight deaths as wildfire spreads in southern Turkey.

BREAKING: Eight deaths as wildfire spreads in southern Turkey.

Sky News' Alex Crawford reports from Turkey where wildfires have taken hold near the resort town of Bodrum. SUBSCRIBE to our YouTube channel for more videos: Follow us on Twitter: Like us on Facebook: Follow us on Instagram: For more content go to...

BREAKING: Team GB win 11th gold medal in eventing at Tokyo Olympics.

BREAKING: Team GB win 11th gold medal in eventing at Tokyo Olympics.

Team GB have won gold in team eventing at the Tokyo Olympics. Laura Collett, Tom McEwen and Oliver Townend secured what is the 11th gold at this year's Games - the team's 33rd medal in total. All three riders delivered high-class displays to end a...

BREAKING: Simone Biles to compete in balance beam final.

BREAKING: Simone Biles to compete in balance beam final.

Simone Biles, who has pulled out of several events at the Tokyo Olympics citing the need to protect her mental health, will compete in the balance beam final, USA Gymnastics has said. The four-time Olympic gold medallist ruled herself out of the v...

BREAKING: Belarusian athlete heads of Polish Embassy.

BREAKING: Belarusian athlete heads of Polish Embassy.

Belarusian Olympic sprinter Krystsina Tsimanouskaya has arrived at the Polish embassy in Tokyo after refusing to board a flight back to Minsk. The 24-year-old was seen entering the building after spending the night at an airport hotel. She said sh...

BREAKING: Simone Biles to compete in balance beam final in Tokyo Olympics.

BREAKING: Simone Biles to compete in balance beam final in Tokyo Olympics.

Simone Biles, who has pulled out of several events at the Tokyo Olympics citing the need to protect her mental health, will compete in the balance beam final, USA Gymnastics has said. The four-time Olympic gold medallist ruled herself out of the v...