Exp	UKBA (United Kingdom branch accounting) is the portfolio in the retail banking business (UKRBB) of Barclays handling the day to day branch accounting activities of all the branches in UK. Balance expansion is a mainframe optimization initiative by the Barclays UK technology division as a part of the company’s strategy in optimization and modernization. All the balance fields in the core banking systems programs are being expanded to cater to the larger balance values thereby reducing the failures occurring in LIVE due to balance overflows and optimizing the execution time of the batch runs in LIVE.