Why has the UK government started an advertising campaign telling illegal migrants to 'go home or face arrest'?

The Home Office has launched a campaign targeting illegal immigrants in which vans will be driven round London with the slogan "In the UK illegally? Go home or face arrest". The vans will also display a text number that migrants can message to arrange their return, as well as showing residents how many illegal migrants have been arrested in their area. Paul Wylie immigration enforcement in London for the Home Office told the BBC

"We are stepping up the arrest work but we're also saying that's not our preference. We actually want people to volunteer to go home. It's in our interest because it costs considerably less for UK taxpayers, but hopefully it's also in the individual's interests...because it's a better way to return home - more dignity for the individual."

https://www.facebook.com/photo.php?fbid=10151809274245229&set=a.292202500228.180573.285361880228&type=1

I will tell the Nigerian government that I was the first to comment. Any Nigerian illegal migrant over there should better save his/her self the national embarrasment.

These tories no just give affuuck.Honestly,people should rather go to their countries and fight it out than hide in a foreign land,especially at this crucial time.

There is no place like home but you got to make it habitable an it your obligations.

these conservatives think it's illegal immigrants that is their only problem...since UK has joined EU, they will always be influx from other less privileged European countries, scamming of the system, over population, high unemployment etc. Maybe it is time for Africans to return and kick out these incompetent leaders that are causing the mass exodus.