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I am afraid that any private Mortgage or Charge can only be registered at the Land Registry unless both you and your husband were to enter into the Charge.
Did your Mother definitely require a Charge before agreeing to lend to you?
My Mum is going to pay for the extension to my house using her own money, as she is elderly and needs care. I want to find out if I can secure her money with either HM charge or other type of charge against the property, without my husbands signature or permission.