Plenty of celebrities - and rich Brits - have Swiss bank accounts. Believe it or not, some are even residents of Switzerland.
But if you are a full UK taxpayer with a Swiss bank account, you have to declare any income from it to HM Revenue and Customs (HMRC).
If you fail to do so, you are guilty of tax evasion, which is an offence.
The same goes for any income you make anywhere in the world, if that money comes in to the UK.
The only exception to that is if you are not domiciled in the UK, so you are a "non-dom".
Thus an American banker who comes to work in the UK for a period of say, five years, might be a UK resident, but also a non-dom.
He or she would not have to declare international income to HMRC.
However, if that banker were to stay in the UK for a longer period, he or she could not maintain their non dom status indefinitely.
Secret accounts
Tax relations between the UK and Switzerland were changed by an agreement that came into force on January 1 2013.
Under the deal, Swiss banks were obliged to declare account details to HMRC.
British account holders with long-standing accounts could agree to pay a one-off levy to HMRC of up to 41% of their income.
Or, if they wanted their account details to remain secret, they could allow the Swiss authorities to levy a tax themselves.
However, that would not necessarily make them immune to prosecution by HMRC.
The agreement also allowed the UK to request the bank details of up to 500 individuals a year.
The deal was supposed to raise £3bn in tax receipts for the UK in its first year. In the event, it only raised around £1bn.