Sarah
You can change the boat name without telling anyone
The boat number, as inscribed on the hull (on the rear end of the keel cover for a timber boat or on the mast bulkhead – visible through one of the centrecase bulkhead hatches for a FRP hull) is the principal identification of a Sabre, This number may not be changed or carried over to another hull.
To join your State Association go to the relevant state page on the website and get the State Secretary’s number or address.
Mike Simpson