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I watched exactly the same video before embarking on our rewire - ended up finding the best result for the lath was accurately cutting box hole so that the box sits tight in it, then using expandable foam. Spraying lots of water first so you get a really strong adhesion with the foam and also pullin the cables pre-foam.
Once hard, cut back the foam to below the surface and filler.
Our flat is approximately 60% foam now. The rest is filler....
terlg
Next question, anyone recessed a socket backbox in a lath and plaster wall? Any tricks or suggestions most welcome.