Saab
I think I know what you are getting at but unfortunately, the IP address I entered had a different node address.
STOP PRESS!!!!
Whilst typing this message the very very nice man in India called me back!! Now there's a first. After talking me through a few more procedures, his final gambit before admitting defeat was to uninstall the three network adapter drivers, then reboot. (We had tried this last time but that was before I'd got full connectivity). Woo hoo! It did the trick and I appear to be connected to the internet.
Thanks anyway for all your efforts on my behalf, that's what I like about PPRuNe