The short answer is that no clear date has been set and predicting one would be pure speculation on my part.
There was speculation in the Sunday Times (19 April) that senior ministers had drawn up a three-phase plan to lift the coronavirus lockdown that would see schools reopen as early as May 11. It was suggested that the first pupils invited back would include primary school children and those in years 10 and 12 who are due to sit GCSEs and A levels next year. However, Gavin Williamson, the Education Secretary, issued a statement shortly thereafter that he could not give a date for when schools will reopen.
The Department for Education (DfE) published a blog on 21 April addressing the question, entitled Schools reopening conditions. It explains that the general secretary of the National Association of Schoolmasters and Union of Women Teachers (NASUWT), sent a letter to the Secretary of State setting out five conditions to be met before schools should reopen – including social distancing guidelines, access to PPE / employment protections for teachers and a recognition of the “depleted” teacher workforce.
The DfE has also reiterated its position in the blog about the matter:
“Education Secretary Gavin Williamson has not set a date for schools reopening.
They will remain closed, except for children of critical workers and the most vulnerable children until the scientific advice changes, and we have met the five tests set out by Government to beat this virus.
We will work in close consultation with the sector to consider how best to reopen schools, nurseries and colleges when the time is right so that parents, teachers and children have sufficient notice to plan and prepare.”
With regards to the five tests that need to be passed in order to avoid a second peak of COVID-19, Health Secretary Matt Hancock has summarised them in the following manner: ‘First, that the NHS can continue to cope, second, that the operational challenges can be met, third, that the daily death rate falls sustainably and consistently, fourth, that the rate of infection is decreasing, and most importantly, that there is no risk of a second peak.’
Thus, reopening schools will be a slow and challenging process for all parties involved, under the principle that safety must come first.