Removed plenty of those. Seem to remember that I did once come across some that were dovetailed and others that were made of a hardwood.
My favourite trick (perfected over many years) was to nibble these boxes out, thread a new cable down the conduit and fit a metal box - all without the need for redecoration.
One of the funniest things I saw (no camera in those days) was an old wooden box like that wired in newish T&E and the cpc was attached by a small self tapper to the back of the box!
I too have had to carefully remove sections of the wooden box carefully to accept a new metal box.
Also had to fit many a plastic patress over these too.
One strange thing I've seen once is a property built around 1960 with the wooden boxes and PVC oval conduit - so when it was installed the boxes were being phased out and the plastic conduit being phased in.
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