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Ohh that must totally be why... not sure if he did... he only really swapped out an old one rather than replace the whole lot so maybe he didn't... anything to worry about?
chrisbmx116-
Nah it'll be fine, it's just best practice to be able to isolate so replacement in future is quicker and clearer (no hunting for the live feed for whatever reason). If it were a new build you'd have to fit one but when replacing like for like you don't have to. It's a good idea to flick the lighting ring off though and not to rely on a switch... you wouldn't start messing with the back of a plug socket just because it's switched off on the front, the power may well daisy chain off somewhere else...
inchpincher
Extractors usually have a permanent live as well as a switched live (the light switch) so they can continue to run after the lights have been turned off. Did the chap who fitted it in the end add an isolation switch so it's an easier job next time? Not critical but I'm pretty sure that's in the regs now.