Ok, so the story continues.
Visited Vodaphone store, helpful chap suggested I had another SIM card and phoned customer services to transfer my details from my card to the new one. I didn't understand why but hey, what the hell.
Phones customer services and tells them the number of the new SIM card, who say the number isn't recognised on the system?
The guy on the phone asks me for my current (not working and discussed at length on here and telephone tech) SIM number and
BINGO, suddenly it has a phone number against it again and £12.73 credit!
Have to phone telephone tech up again to get it working as it wouldn't connect but now all seems well.
Work that one out, it's way, way beyond me.........?