Kirsty,
I found some good info on those S.A. sites. Including a date they arrived in Adelaide!
They came over on the ship Devon (I don't now where it departed from) arriving in Port Adelaide on the 4th March 1880. I also then found a record of him starting work with the Police on the 5th November 1880. He was married then, and was married prior to departure (as his wife's name was also on the list I found). This is where I found the info re the ship (GRG35/48 Records relating to official assisted immigration - Crown Lands and Immigration Office)
I haven't been able to find a passenger list for that ship however, and I don't know where it departed from, and who got on where.
I assume for any more info re: the police record, I probably have to visit the State Library?
Thanks for all the help, by the way.