I've applied for a mortgage and the lender has come back and said I have locked my credit file and I need to unlock it so they can do the credit check. I have no idea what they mean and nor does my solicitor or my broker. I've been told by Experian that there is no lock on my file and I've made data subject requests to Equifax and Transunion which I'm waiting for responses on. Has anyone had this and managed to resolve it? If so how? I'm at risk of losing the purchase so getting quite desperate. Any advice appreciated.