International Currency Exchange began life with one shop in London’s Victoria train station, but has grown to have more than 400 branches across Europe, the US, Mexico, China and a number of other countries.

As well as in train stations and city centres, it operates in more than 60 airports.

Raphaels Bank, regulated by the Financial Conduct Authority, dates back to 1787, and has had a varied history including funding the 1890 rescue of Barings Bank and raising loans for European governments in the 1800s.

Today it is mainly an ATM provider and credit card bank, and the founding Raphael family has not been involved since 1983.

Lenlyn Holdings, chaired by former RBS small business chairman Peter Ibbetson, made profit before tax of £6.1m in the year to February 2013 on sales of £807.5m. KPMG declined to comment.