If you are concerned that you are either working illegally or employing illegal workers in the UK it is highly important that you change your circumstances as soon as possible.
You can be classed as an illegal worker if you do not have leave to remain in the UK; or if the leave you have is invalid or has ceased to have an effect. You will also be classed as an illegal worker if your leave to remain does not allow the kind of work you are involved in.
You could face a six-month prison sentence with an unlimited fine if you are found working without the rightful paperwork. In addition, any income you earn as a result of working illegally may be seized by the Home Office
Where businesses are found to be in breach of their immigration duties, a civil penalty for illegal employment may be served – up to £20,000 per breach.