One B

Dear HMRC, I am the sole legal owner of my rental property and I would like to assign 100% beneficial ownership to my wife via a deed of assignment. Legal ownership will not change and title of the property will remain in my name. I use a solicitor to draft it. I have four questions: 1) once the deed in place, I was told that we do not need to submit Form 17 as we are married and the legal ownership doesn’t change. I was told to keep the copy in case HMRC wishes to verify it. Is this true? 2) I was advised to register the deed as a trust with HMRC as failing to do so would incur £5k penalty. Is this correct and if so please attach the link to register it. 3) would the assignee (my wife) be able to claim 20% mortgage relief? Mortgage is in interest only type and is in my name. 4) if my wife cannot claim mortgage relief and I decided to assign her 90% beneficial income, would I be able to claim mortgage relief with my 10% beneficial ownership? Many thanks for the answers in advance.