While I understand your frustration and anger at the seeming lack of response from NTL and your bank, can I ask a question?
You stated - "The third is DD mandate 9 and started 21/1/03 £24.99 and monthly to date. I do not know what this is and could only guess that NTL has been fraudently overcharging me for over three years. Nearly £1000! I don't know how many times I've been overdrawn because of this. If I had the money to put in a regular saver it would have even earned me a good sum of interest!"
It's taken you 3.5 years to notice this - whilst NTL should not have done this, don't you think you have some duty to check your bank statements a bit more carefully?
Also, you stated "I have sent a circular to thousands of Tessa, Aslef and RMT members all over the country asking them to boycot NTL and check there bank accounts for fear of abuse."
mmm, could be exposing yourself to claims of libel from NTL - be careful.
(hides his head, waiting for it to get blown off)