Schools in England are expected to be told to overhaul the curriculum, stagger break times and group children into “bubbles” when they return to the classroom in September, according to guidelines to be published by the Government.

Education Secretary Gavin Williamson is due to announce the plans for getting all pupils back after the summer following up to six months at home – on the same day schools in Leicester close again as part of the city’s lockdown extension.

The Daily Telegraph reported that a draft of the official guidance also bans the mixing of year groups – such as in assemblies – as well as school choirs, and suggests teachers also stagger the start and end of the day.

It follows an announcement this week about how final grades could be appealed - or exams take.

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September's contingency plans must also be in place in case of a local lockdown, the paper said, and schools will be required to liaise with their local health protection team if there are two or more confirmed coronavirus cases within a fortnight.

A general rise in sickness or absence where Covid-19 is a suspected cause could lead to a year group or the whole school being told to stay at home and self-isolate as a precaution.

Details are expected to be set out at a Downing Street press conference on Thursday – the first time one has been held since daily briefings were scrapped last week.

The Office for National Statistics will on Thursday provide new figures from the coronavirus infection survey for England, and the latest data on the NHS Test and Trace programme will also be published.