Ashley Gill-Webb, 34, who threw a plastic beer bottle at competitors in the men's Olympic 100m final, has been sentenced at London's Thames Magistrates' Court to an eight-week community order for public disorder.
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The Grammy-winning singer posted a picture of the two on his Instagram saying the two got engaged right before the new year.
British Airways said it was taking the matter "extremely seriously" and is assisting police with their enquiries.
The rest of this weekend will see further spells of rain or snow across the UK. Icy roads expected