The actual response is a little more complicated and usually it is dependant on your Local building inspectors requirements to sign the building off. However .... general rule of thumb is:-
1, single dewelling (House, not divided to to flats etc) not required to be fire rated
2, multiple dewelling (With concrete fire breaks) not required
3, multiple dewelling ( Without concrete fire breaks) fire rating required
4, Local authority property always required.
Hoods are a pain in the ---, use the fire rated cans (I agree with brightspark above, no relation), basic ones such as the Aurora AU-DLL991 are easy to instal and of a reasonable price, see link.
Aurora - 'Passionate about Lighting'
The fire rated downlight and fire hoods are there to 'reinstate' the fire break properties of the ceiling they are cut into.
Hope that helps