Gatwick have released a new advert in response to Heathrow Airport's plan to increase the M25 to 14 lanes if their expansion plans are approved.
Both airports released their final submissions to the Government's Airports Commission today.
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Acting Commissioner Craig Mackey led new policemen and women in paying their respects at a passing-out parade in Hendon, north-west London.
The tour of European capitals was timed to coincide with the start of the Article 50 process to exit the EU.
The Football League will introduce the project if the family of PC Keith Palmer supports the idea.