I was renewing mine recently and my application was sent back because it was deemed incomplete because I had not included my full birth cert, so I'd say send it rather than having it returned.
ok thanks for reply....was in a state because I could not find my birthcert and it an american one but I'm after finding it now, but I only have the short one........hope it will do. Its very hard to tell from the application if one should send a birth cert or not.