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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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.