About the lion head symbol, any Singaporean company can use it but indeed, you require permission, but you don't have to pay any fees and so on. I don't think they allow any other lion head symbols similar to that one, because it is protected by copyright law and you might get a lawsuit filled against you. Any similarities are involved. I highly advise the the client to read that website and send them a request regarding the usage of the symbol, after - of course, they pick a winning logo.