Finding yacht owner

I want to find the owner of a yacht in Lisbon Portugal. I have boat name location license#. I was asked for £150 by a consultant who would only give me what’s in government records. For that price and want a phone number and him to verify jts accuracy. Does any one know a cheaper connection or more accus me

Does any one know of cheaper ways

Have you tried Google ?

Have you tried knocking on the hull and asking for the HMFIC?