Whiplash victim Gavin Redman said: "I've been injured three times. If you've been involved in an accident, it's not your fault, why should you be made to suffer. It's just not fair.
"Each time I've been injured I've been to see a consultant who's gone through quite a rigorous examination of me, told me to explain all my symptoms. He's then made the diagnosis of how long it's going to take me to get better, nobody else."
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The prince laid a floral wreath at one of a group of metal crosses near Wellington Arch in central London.
The group, which also owns Premier Inn, said on Wednesday that it will pursue a ‘demerger of Costa’.
The showers will become more frequent as the day goes on, giving some heavy downpours in places during the afternoon.