My ex wife walked out on my children and I in October 2009. As soon as this happened I called the HMRC to inform them and start a new claim as a lone parent. In April 2010 I was sent a letter stating that based on the earnings I had that the HMRC had underpaid the credits. It took a while to get back to them but when I did I informed them of my earnings for the tax year April 2009 to the end of that claim in October 2010. I was told that the underpayments would come to me and I had to confirm bank details. They said twice that they were going to pay into my account but no money materialised. I tried on at least 4 occasions to confirm my details each time being told there was a problem with the kind of account i had given them. Each time they also confirmed ALL the money would come to me. In between this my ex-wife told me she had also had a letter concerning the underpayment and had sought advice from the Citizens Advice who had advised her that the Child Tax Credit element was in her name and she was entitled to it. I told her I had been told the opposite and to not worry about it. I then did not recieve it and she "mentioned" she had had a letter and later that day I discovered she had also recieved GIRO cheques in her name for the CHILD TAX CREDIT element. She subsequently has spent the money on herself! I called the HMRC to be now told that because she was the main child carer at the time of the claim and because the bank details did not match her name. She was sent GIRO's for the CHILD TAX CREDIT. I am still awaiting any payment for the WORKING FAMILIES TAX CREDIT underpayment. Does anyone have any information on how I can get this resolved?