Measurement certificate The RYA Technical Department deal with certification.
When you buy a secondhand boat, the owner should pass on their certificate to you, which you then post to the RYA with your details, and a fee (which was £20 in Feb 2006), in order to register you as the new owner of the boat. Your certificate records all measurement details, including sails, and also buoyancy endorsements.
Buoyancy test In previous years this would involve an official measurer checking your boat, but the RYA proposed a new method in 2003 whereby the owner takes responsibility for ensuring their boat would float if capsized, and signs the certificate themselves, in the presence of a class official. Contact the MROA Measurement Scheme Officer for advice on the process, and details of an official near you.
Insurance Racing demands you have third-party cover for your boat to at least £1M.
Ask for advice on the forum if you can't find a good quote!
Club membership To race in class events, you must be a member of a sailing club or join the RYA itself (it's a legal thing!). It always helps to get to know a few local sailors, for advice on rigging and sailing your Merlin, to camaraderie in the bar afterwards!