All banks have their customers at heart of course. Following the recommendations issuing from the Independent Commission on Banking chaired by Sir John Vickers, a number of banks are warning that customers could undergo 'significant disruption' if ringfencing is brought in. Some banks (ie HSBC) are even calling for recommended changes to be delayed until 2019! This is apparently when new international rules come into force. The Vickers Report is obviously not to our banks' liking, with Barclays stating: "We are concerned that this structured measure (ringfencing), especially if enacted in the UK alone, will have detrimental unintended consequences for customers, financial stability, competition and the economy."
Ringfencing, a measure to seperate risky investment banking from day-to-day high street banking, is meant to prevent any further shenanigans from bankers operating 'casino' finance arrangements. That's the crux of the matter, of course. They want to continue playing loose and easy with our money, hence all the warnings and whining about effects on customers and the economy.