Colin Mercer, the owner of The Lysses House Hotel in Fareham, shook hands with Eric Clifton after he agreed to reimburse the widower for an anniversary party after he was forced to cancel it because his wife died.
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Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.