Thanks again Comrade... really helpfull mate.
This is what I received from CASA today:-
"UNCLASSIFIED
Good Afternoon,
Thank you for your email.
We can confirm CASA can convert your type rating for ATR42/72 from Asian Aviation Training Centre to your CASA FCL. We would require form 61-4CT with all certified documents as per your checklist in application.
If you have any concerns please do not hesitate in contacting us.
Kind regards,"