Another 18m Safeway shares were traded and the close was 11 1/2p higher at 315 1/2p, making a two-day gain of 24 1/2p. Britain's fourth-biggest supermarket was linked with a possible £6.8bn nil-premium merger with William Morrison, 8 1/2p better at 229p. French hypermarket giant Carrefour, linked with the grocer on Tuesday, said it was not interested.