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Shared neutrals. Usually found on two way switching.
Or possibly induction in the circuits. Do you have fluorescent lighting?
Have you used a multimeter to check it's at 230V or a test stick?
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What indicates there's still power? Even if you've isolated a circuit then touch a neutral & earth it will trip the main RCD on the consumer unit (I think).
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Search for "ghost voltage" if you want to know more about that phenomenon. Otherwise as others have said, it could be shared neutrals which are often found in hallways, especially if you have an upstairs and downstairs lighting circuit. Though the fact that the lights don't work would suggest it's not 240v.
Mr_Sworld
inchpincher
Airhead
@Fox
I'm a big fan of centrifugal, err...
Bathroom extractors that actually do something are a revelation though, really.
Question for you as an ex-electrician or someone else who knows this stuff: why when I turn off my lighting ring on the fusebox is there still power in some of the cables, even when the circuit is turned off and the lights don't work?
I need to move a light switch sightly and was hoping not to have to turn all the power off.