Since 1999, banks and building societies have not charged customers for withdrawing money. However, smaller firms have spotted a niche by providing additional cash machines in 'convenient' locations. They typically charge ?1.50. Some 70% - around 1,500 - of all machines in Post Offices, most of which are operated by Alliance & Leicester, now impose a fee. The annual bill for taking cash out of such machines is currently running at £60m, but this is set to spiral.