By Jonathan Davies

'Bank holidays' are the most common form of public holiday in the UK. But could they become a thing of the past?

More than 100 bank branches will be open to the public for the first time on Spring bank holiday (4 May).

RBS and NatWest have said they will open 34 branches as part of a trial. Barclays usually keeps 40-50 branches open on bank holidays and Metro Bank has said its 34 branches will stay open as usual.

HSBC, Lloyds Banking Group and Santander all said that they have no plans to open branches on Spring bank holiday, or any other bank holidays.

The Bank Holidays Act was passed in 1871. Initially, it guaranteed four bank holidays a year, in addition to Good Friday and Christmas Day.

RBS said there is significant demand from customers who want to discuss mortgages on bank holidays.

"Many of our customers have busy lives, but are off work on a bank holiday," said Jane Howard, managing director of branch and private banking for RBS and NatWest.

"At a time when many people are thinking of buying a house, we're breaking with tradition and opening our busiest branches," she said.