This is the response I have from my Dealer with respect to the noise:

"I have duly read your comments and concerns and can advise in relation to the “ pinging/rattling ” you are experiencing that Honda Technical have received a small number of similar incidents and have reported same to the Factory and are waiting for direction from them. Until such time as to that investigation being concluded we would not attempt to carry out further diagnosis, however we will advise you accordingly as soon as we receive advice from Honda. If you wish to lodge your concerns directly with Honda Australia on this issue phone Customer Assistance on 1800804954.

While I can understand your frustrations at this point in time I can only reiterate that until we receive advice from Honda we are unable to finalize the engine issue."

Accordingly, I will be contacting Honda Australia but other than that they are working on it and only time will tell if there is a viable solution.