Nearly a thousand businesses the length and breadth of Britain were fined more than £37million for employing illegal workers last year.
Firms received penalties of up to £360,000 as part of the clampdown, which exposes the vast size of the UK's 'dark economy'.
The ability to work without papers is considered a major pull factor for migrants overstaying visas or arriving illegally on small boats and lorries.
MailOnline used Home Office data covering the whole of 2024 to name and shame businesses that have been caught out.
They range from car washes, barbers, salons, hotels and takeaways to haulage firms, care providers and home renovation services.
