Large billboards and signposts carrying the warning "Go home or face arrest" will be driven around London on the back on advertising vans this week in a new Home Office bid to reduce illegal immigration.
The billboards will also display the number of illegal migrants arrested recently in the relevant part of the capital.
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Police said they are "extremely concerned" for the welfare of a "vulnerable" mother and her two children who have gone missing in Bexley.
It is hoped the 7,400-mile journey will become a cost-efficient and time-saving way of transporting trade between China and the UK.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.