Why is this happening?
RBS made a bit of a mess of things in the lead up to the financial crisis and had to be bailed out by the taxpayer to the tune of £45bn to keep it afloat.
As part of the compensation measures, it was originally agreed with the European Commission that RBS would transfer customers of The Royal Bank of Scotland in England and Wales and NatWest in Scotland into a relaunched Williams and Glyn Bank and then divest of that business.
Selling proved harder than anticipated so an alternative Scheme was established to boost competition in business banking in the U.K. by giving financial assistance to to a number of challenger banks, funded by RBS. This is known as the Alternative Remedies Package or, more commonly, the Business Banking Switch.