Currently Being ModeratedJun 17, 2013 3:29 AM (in response to Hamish MacBeth)
A quick update for those interested.
Have managed to install 10.7 Lion - this has solved all Internet access problems and am now back online.
I can only deduce that a major bug/coding issue, for whatever reason, was stopping me getting online with 10.6.8.
I am now rediscovering the joys of a new OS which results in other pieces of software not working eg Cisco VPN - oh well.