This is a real grey area for some people. I asked the very same question here last year.
I was referred to a link on the ECA website where it states it is not a requirement to use hoods or fire rated downlighters, as the whole shell of a house is a fire containment. New or old the same applies.
Now, several BC officers have also told me the same thing and said they would only insist on any downlighter being fire rated if it was say in flats or a house converted to flats, so as to protect occupants above or below.
I'm sure loads of you will disagree but this is the correct info. I will try and find the link. Don't waste money on fire rated downlighters unless they are specified is my advise.