The family of an Ilford holidaymaker who died in police custody in Dubai want the Prime Minister to raise the death of their son with the country's president.
David Cameron has already said he'll discuss the case of three Londoners who say they were tortured by police there, during the state visit.
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Muslim leaders condemned the "heinous and appalling" Westminster terror attack.
Travis Frain is recovering in hospital and has posted a photo to Twitter of Prince Charles by his bedside.
Acting Commissioner Craig Mackey led new policemen and women in paying their respects at a passing-out parade in Hendon, north-west London.