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I think the problem here is booking ‘handymen’ who can’t or won’t put the time in to do it properly as it’s just not cost effective for them.
I could possibly do it but don’t want to charge but don’t really have the time.
None of the people they paid to do it had a proper drill, I had to lend them an SDS!
No, it's a different product called "WETNFIX". I've used them in a similar situation after buying them on sale out of curiosity and they've worked fine. In the described scenario I'd probably use a couple of them, as it sounds like the hole in the plaster is big.
If that doesn't work or you really want to go belt and braces, what I'd do here is take it all off, clean out the hole with a dry brush and then a wet one to really get rid of the dust. Then fill it up with a very thick mix of a good powdered filler like toupret. Make sure you really overfill it and pack it in. Then let it go off, if it shrinks at all do a second pass.
Then sand, redecorate, and then drill a hole into the lintel deep enough that the full plug you plan to use will sit completely in the lintel. Drill the plaster marginally bigger than the first hole using a non hammer drill. Use a long screw to hammer a plug back and make sure it is in the lintel completely. Then use a long screw to fix.
That should be really solid with no chance of movement or future crumbling.