LONDON (Standard&Poor's CreditWire) Nov. 30, 1999--Standard&Poor's today placed its ratings on Royal Bank of Scotland Group PLC (RBS; single-'A'-plus/'A-1') and related entities on CreditWatch with positive implications. (See list below.) The CreditWatch actions follow RBS's bid on Nov. 29, 1999, to acquire National Westminster Bank PLC (NatWest; double-'A'/Watch Neg/'A-1'-plus). RBS' offer values NatWest at about £26.5 billion (US$42.6 billion). The offer has not been recommended to NatWest shareholders by the board of NatWest. The RBS offer values each NatWest share at about £15.90. This offer is higher than the one made by Bank of Scotland (BoS; single-'A'-plus/Watch Pos/'A-1') on Nov. 26, 1999, based on the share prices of BoS and RBS at close of business on