Paul Hawker, Station Manager at Buxton Fire Station, says people battled in vain to save the driver whose car plunged into the icy river.
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The mother-of-two said she was told by RSPCA investigators they were looking at the possibility that poison-laced sausages were involved.
The Beatle made several stops during his trip through Liverpool with James Corden and shocked many Scousers along the way.
Tributes have been paid to former Manchester City goalkeeper Ron Healey, who has died aged 65 after collapsing on a cycle ride.