Corrupt immigration advisers are helping illegal workers dupe the Home Office in a cash for visas scam, a Mail investigation has found.

They are charging up to £22,000 per person to provide 'skilled' jobs in the UK for under-qualified foreign workers.

It comes amid concern skilled worker visa routes could be hiding an immigration scandal 'worse than the small boats crisis'.

Critics claim it could render Sir Keir Starmer's immigration crackdown pointless after he made new restrictions on skilled visas a major tool in ending the economy's reliance on cheap overseas labour.

The ruse has proved so lucrative that many companies have started up just to profit from hiring foreign staff – then shut down after a year, having extorted migrants and exploited them for cheap labour.