Despite the cold water, the open water swimmers found the challenge great fun:
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Jane Kirkpatrick, 29, knifed Danielle Nicholson in the legs with a knife she picked up inside her home.
The NSPCC is calling for increased support and training for police to help tackle the issue.
A 73-mile diversion will be put in place when a three-mile stretch of the A66 between Keswick and Penrith is closed for roadworks.