LONDON (Standard&Poor's) Oct. 16, 2015--Standard&Poor's Ratings Services said today that its 'AAA' credit ratings on U.K.-based Barclays Bank PLC's covered bond program and related issuances are unchanged following proposed amendments to the transaction. On Oct. 16, 2015, Barclays Bank PLC proposed amending the terms of four covered bond series issued under its covered bond program. The purpose of the amendment is to change the "hard bullet" maturities (where the full principal amount is due on a fixed redemption date) to "soft bullet" maturities (where the repayment of principal can be extended for up to one year under specified conditions). The four covered bonds for which the extended maturity feature will be applied are series 2009-1, 2010-2,