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Thanks for your comments everyone. I decided that installing a new spur, or any new circuit, needs to follow modern conventions regardless of the existing wiring. I also decided that it is unacceptable to provide a "false" earth because that could be mistaken for a true earth in the future...

Thanks. I've chosen an in-line timer fan that is mounted in the loft above the bathroom ceiling to avoid the notification requirement. I'm using all plastic SW & FCU with 3A fuse to isolate both the fan and bathroom light and pull-switch (the latter is required by the fan) and 1.5mm twin &...

I am adding an extractor fan to an existing lighting circuit. The existing wiring is all 2 core (Red & black) with NO earth. 1960s build. The fan is double-insulated and has no earth terminal. Is it ok to add the spur, FCU etc. without any earth connection OR is it necessary to add a new earth...