An off-duty policewoman who was killed by a lorry as she helped at the scene of a crash "epitomises the very best of British policing", a senior officer has said.North Yorkshire Police Constable Rosie Prior was standing on the verge of the A19 at Bagby, near the town of Thirsk, on Saturday morning, after coming across a road collision, when she and two others were struck by a heavy goods vehicle (HGV).Pc Prior and Ryan Welford, 41, from Knaresborough, who had been involved in the first collision

An off-duty policewoman who was killed by a lorry as she helped at the scene of a crash "epitomises the very best of British policing", a senior officer has said.North Yorkshire Police Constable Rosie Prior was standing on the verge of the A19 at Bagby, near the town of Thirsk, on Saturday morning, after coming across a road collision, when she and two others were struck by a heavy goods vehicle (HGV).Pc Prior and Ryan Welford, 41, from Knaresborough, who had been involved in the first collision, both died at the scene.