Thanks Bob, I have seen that entry before and dismissed it, because it is very confusing. Now, I'm sure it's the same Ship, and list of Convicts on the Calcutta as John Boothman is there as well.
This Web Site states the Calcutta's destination was Sydney, yet everything I've read says Lieutenant Governor David Collins job was to establish a colony at Port Phillip. The storeship Ocean sailed direct to Port Phillip, and arrived there 6th or 7th October, the Calcutta arrived two days later.
So 26th December destination Sydney is .... Huh?

?
When Collins abandoned Port Phillip in May 1804 he then set sail with his marines and prisoners for Van Dieman’s Land, presumably in the Calcutta. No mention is made of that on this Web Site.
However, many thanks it now gives me a list of the convicts on board, which is what I was looking for.
Cheers, Kevin