A lot of the transformation was caused by those who moved to building societies with the intention of changing them to banks and cashing in on the windfall. Th

A lot of the transformation was caused by those who moved to building societies with the intention of changing them to banks and cashing in on the windfall. They were known as carpetbaggers: https://en.wikipedia.org/wiki/Carpetbagger#United_Kingdom https://en.wikipedia.org/wiki/Carpetbagger#United_Kingdom