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@absurdbird
As has been said before (I think) the continuity of the earthing through the metal conduit will possibly be broken - conduit coming adrift from junction boxes etc.
I had a similar situation on a job I did in a 60's conversion of a regency building a few years ago - we had to run new earth alongside the conduit, through it in some places.
It would have been easier just to rip it all out and start again - but not cheaper...