On Saturday, Mr Johnson will be at the G7 summit where he will meet other world leaders including US president Donald Trump.
A passenger watchdog demanded that train operators must do ‘everything possible’ to prevent a repeat of the error.
The research comparing cat owners, dog owners and those with no pets was carried out at the University of California, Los Angeles.
One resident said she cried after arriving at the containers having previously lived in the Calais jungle.
Police departments across the UK say they have been given ‘thank you’ presents from members of the public following the death of Pc Andrew Harper.
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