Thanks for all the suggestions.
I now have a working connection again
the 0808 number works, though why it never worked in the beginning is beyond me.
Neil: Yes I do have a BT line, and believe me if I had any probability of getting a DSL connection, then I would jump at the chance, but I think it'll be about 18 months until it happens in the little village in mid-wales where we live. Oh, and I installed a second phone line so that we can use the phone and the internet at the same time - so the cost for 'net access for me will go down when ADSL actually arrives.
Oh, and NTL tech support never actually phoned me back - I really didn't expect them to if I'm really honest about it, but you never know, sometimes the highly improbable does happen.
Thanks all, and I may drop back in again when I don't have a problem ;-)
Rich