I knew I should have bowed down to you superior knowledge Would be better if Scan actually had any replacement 7950's in stock I am chasing them up for an expected delivery date as we speak.
Further update, Scan didn't have a expected delivery date for any 7850's so after much umming and arrring I've done something I have never done before and gone Nvidia with a EVGA 2GB GTX760 SC +ACX which should arrive tomorrow. Hopefully I will be back to playing BF3 (badly) again shortly!