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Another fan, Holly Whiteman, said she "panic bought" Beyoncé tickets in a fan pre-sale on Ticketmaster, which were "way up in the nosebleeds" and cost £170 each, when she had initially set a budget of £100.

Whiteman said the process had left her a bit "disappointed", but she was still looking forward to the tour.

Mr Whiteman said school leaders embraced accountability, but said it was "utter nonsense" that Ofsted's proposed model was the only viable way to assess schools.

Its general secretary, Paul Whiteman, said the plans amounted to "another crude grading system to hang over the heads of leaders", and should be scrapped.

Paul Whiteman, general secretary of school leaders' union NAHT, said members shared the commissioner's concerns.