The Inland Revenue will first launch an enquiry into your UK tax affairs. This can be both on a random or targeted basis and is a review intended to audit your tax affairs and claim any taxes that were not paid. If however HMRC discover deliberate fraud and/or tax evasion then the enquiry could become a full blown tax investigation. This is very serious and could lead to criminal charges.
Tax Compute can offer detailed professional advice and try to mitigate the outcome of investigations as much as possible. However our advice is always to be 100% above board and ensure that your tax affairs and records are accurate and compliant.