A message from April's family, written on the order of service, said: "Paul, Coral, Jazmin and Harley would like to say a big thank you to everyone for their overwhelming kindness, sympathy and support during this sad, sad time."
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It is the fifth publicly known guilty plea in the probe into possible collusion between the Trump campaign and Russia during the election.
Louella Eve Fletcher-Michie, daughter of Holby City actor John Mitchie, died last year at the Bestival music festival in Dorset.
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