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Hi, you will need to complete Land Registry form SEV (Form A Restriction) and which needs to be signed by both of you. The Land Registry are not interested in knowing what percentage shares you both hold and they are merely interested in knowing that you hold the property as tenants in common. By completing the SEV, the Land Registry will then enter the Form A Restriction on the title which will be evidence that you hold the property as tenants in common. As you wish to hold unequal shares, you will need to prepare a separate document (which can NOT be registered at the Land Registry) stating what share each of you wish to hold in the property. You should prepare 2 copies of this Deed and both of you should sign each copy and then each of you can retain one copy each for future reference. As regards the wording of the Deed, I can discuss this with you but it may be best if we can discuss this over the phone.
Kind Regards AL