BBC Radio 1 will play "up to five seconds" of the Ding Dong record on Sunday's official chart show, station controller Ben Cooper has told the BBC News Channel.
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A one minute silence has been held at the Queen's Garden Party in memory of the 22 people killed and 59 injured in the Manchester attack.
Mancunians have come together in defiance after a suicide bomber killed 22 people at a concert.
Extra armed police will be deployed to Wembley and Twickenham this weekend, police have confirmed.