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Hey there, well she found out that it is actualy hers so that's it solved. She hasn't worked since 2006 although she had it in her ind that it was 2005 therefore thinking that they made a mistake, but no it was right as my mum had filled in a working tax credits form back in Jan 06 as that was when she began a part time job and that is what the tax office have her down as working in the year 2006 but as my mum thought it was 2005 that's why she got a bit puzzled as to why she got all that, but today she found out it is hers so that's that. Cheers for all the responses though!