RBS chief executive officer Stephen Hester was quoted by Bloomberg as saying that regulatory environment has changed drastically what the bank has expected.

"U.K. regulatory reforms on their own have probably cost 10 to 20 billion pounds from our future market value," Hester told the news agency.

Independent Commission on Banking (ICB) appointed by the UK government said in its recommendation that major banks should concentrate to boost capital base and work actively to emerge from the previous bankruptcy.

The commission also recommended that the banks have no right to utilize the consumers’ money to fund their investment banking operations.

The UK government invested £45.5bn into the RBS to overcome from bankruptcy of 2008, which is the costlier bailout package provided by any government to a bank until today.