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Rewiring and replumbing will I guess be on the list for sure if it is all original.
Just knock the whole thing down and start again
Can't help but feel the gap between contemporary standards and 1930s stuff is so great there's a point where you'd need to consider just demolishing and having at it properly.
Obviously not entirely viable if the place is terrace or semi, but the example was detached, so...
Don't forget the rewire...