Hint: Credit card company.
Answer: Solo
Solo is a debit card in the United Kingdom. It is a sister to the Maestro debit card. Solo was launched on the 1st of July 1997 by the Switch Card Scheme for use on deposit accounts, as well as by customers who do not qualify for a Maestro (formerly Switch) card on current accounts.
Solo was formerly issued as a multifunction cash card by NatWest and The Royal Bank of Scotland to customers over the age of 11 and by HSBC Bank (formerly Midland Bank) to customers over the age of 13; however, the RBS Group and HSBC both now issue Visa Debit cards in place of Solo.