I agree with westward and intoelectrics, connect the browns together and it might work.
Regarding those earths and the old wiring, chances are there is no earth on the old original circuit.
Avoid metal light fittings!
My gut feeling is that there was originally one centre light in the room...
It looks as though the wiring to the switch is missing.
The cable looks quite modern (new colours).
The earths in the ceiling rose should be connected to the big brass terminal.
Have you got a picture of the other hole with one wire?
The image shows an example of the earthing and bonding arrangements where an installation in a house supplies an installation in a detached outbuilding, forming part of a TT system with its own installation earth electrode and MET. It is desirable for there to be no connection between the...
Hi, your plan sounds ok apart from the additional earth rod.
You can use an earth rod at the garage, but you must isolate it from the supply earth and treat the garage supply as a new TT system.
You need to do this to avoid parallel earth paths from the original installation.
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