Well I managed to find a replacement release bearing assembly, Brakepro in Pioneer Avenue, Thornleigh, managed to get me one overnight and for $88.00 which I didn't think was too bad.
While I had the transmission out I thought I would check what weight it is. The bathroom scales went 30 to 40kg round the second time, past the 120kg maximum so I reckon it must be at least 150kg. No wonder I have a bad back!
Now I just have to put it all back together again.