Roman Mervart

My wife and son are legal owners of a rental property which they hold as tenants in common indicated by the Restriction* in the Title Deeds. So far, they paid income tax 50/50 but would want to change the beneficial ownership to 90% son, 10% wife. *RESTRICTION: No disposition by a sole proprietor of the registered estate (except a trust corporation) under which capital money arises is to be registered unless authorised by an order of the court 1. Does any documentation need to be submitted to HMRC (e.g. Deed of assignment or Declaration of Trust….) OR is it adequate to keep own records and pay income tax in new ratio 90/10? 2. Could this change to 90/10 beneficial ownership be made retrospectively to the beginning of this tax year? 3. Will there be capital gains tax arising as a result of this change? 3. Is any change in records required to be made/submitted to The Land Registry?