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Well, after a long discussion with a close friend, and after all the helpful answers I have had here, I finally got the courage up to ring the CSA (I'm not good on the phone, I get all muddled up!).
I am glad I did it, as the lady I spoke to couldn't have been nicer. She was very kind, sympathetic and understanding. She said she thought it was strange that the case had been re-opened, because usually that only happens at the mother's request. She said she presumes that 'the man' must have been tracked down after all this time and it is possible that he might have decided to have a DNA test this time.
She told me that it's the law to comply with a DNA test request from the CSA and that if I don't comply, I will lose 40% of my benefit as a penalty. So basically I don't have a choice. As has been said here, if he is the father he will have no rights and would have to take me to court if he wanted access, but it is very likely the judge would rule in my favour and not allow any contact. She also said that if he had been violent towards me in the past, the CSA would have done a 'Good Cause Action' and closed the case permanently.
I have agreed to have the DNA testing done and will receive a letter next week. He will have to be tested first. The results will take about 2 weeks and we (inc.CSA) will all find out on the same day. If the result is negative, I will be shown a photo of the man who took the test to confirm if it was him or not. If the result is positive, he will have to pay ME (not the CSA as first thought) 15% of his net weekly wage in maintenance. As I receive Income Support, I will only be entitled to keep �10 of that per week (but actually I work part time so it might be less than that, I'm not sure) and the rest will go to the Secretary of State to offset my benefits.
So there we are! I'm feeling a lot calmer now ;o)
I shall keep this thread updated as and when things happen as it