LONDON (Standard&Poor's) March 25, 2010--Standard&Poor's Ratings Services said today that it lowered its ratings on "may pay" Tier 1 securities issued or guaranteed by The Royal Bank of Scotland Group PLC (RBSG; A/Stable/A-1) to 'C' from 'CC'. At the same time, the rating on the RBSG-related security issued by Argon Capital PLC was similarly lowered to 'C' from 'CC'. The counterparty credit ratings and stand-alone credit profiles of RBSG and subsidiaries, and the ratings on other debt securities issued by these entities, are unaffected. These rating actions follow today's statement by RBSG regarding a planned liability management exercise. RBSG announced that it will offer to exchange existing Upper Tier 2 securities into senior unsecured notes, and