Sue Hawkins, from the Support Stafford Hospital campaign group, believes major changes have taken place at Stafford Hospital, and argues the planned cuts to services should not be allowed to go ahead.
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They will be joined by Duke Dumont and Disciples at this year's festival in Staffordshire.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
A cloudier start, but turning dry, sunny and warm.