The strict new controls on daily life to help control the spread of coronavirus cover all four local authority areas – Barnsley, Doncaster, Rotherham and Sheffield.
As part of this, all pubs and bars must close, unless they are serving “substantial meals”, as well as betting shops, adult gaming centres, casinos and soft play centres.
Under Tier 3 rules, all shops are able to remain open - even those which were classed as 'non-essential' earlier this year.
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No guidance has been issued on whether hairdressers and barber shops can stay open.
Businesses must ensure that they operate in a COVID-secure manner, including restrictions on table service and group bookings.
They must also ensure that if their workers are required to self-isolate, they do not work outside their designated place of self-isolation.
Businesses and venues in Doncaster must ensure people do not meet in their premises with people from outside of their household or support bubble.
Those that fail to comply with these restrictions may face fines of up to £10,000, prosecution, or in some cases closure.
The government will also discuss with the council the possibility of closing indoor and outdoor entertainment and tourist attractions and venues, public buildings, such as libraries and community centres and performing arts venues.
Gyms will be allowed to stay open but gym classes will be banned. According to the Gov.uk website, exercise classes and organised sport can still take place outdoors in groups of no more than six. Social distancing must still be adhered to.