Many thanks for the help, we've identified H as Mudeford SC , I should have known that one, it looks that we will have less room for Burgees so the unidentified ones may have to go into storage.
G is from Kantvik yacht club: the symbol can be seen clearly on the home page: http://www.kantvikinpurjehtijat.fi. Kantvik is a suburb of Kirkkonummi, a municipality just west of Helsinki, Finland.