Schools in England are being "severely hampered" by delays in Covid tests for teachers, say head teachers.

Jules White, organiser of the WorthLess? network of over 5,000 heads, says there is growing frustration at the lack of access to testing.

This means teachers have to isolate and that "serious staff shortages" could force partial closures in school.

But a government spokeswoman said "testing capacity is the highest it has ever been".

Mr White, a West Sussex head teacher whose group grew out of a school funding campaign, has written to England's Education Secretary Gavin Williamson to warn of disruption from delays in Covid testing.

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