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Last time I was digginga trench & removing old fence-post concrete, I used a big old breaker (which I managed to put through the top of my foot at one point).
I ended up hiring a couple of fellas (who must have been in their 60s ) to finish it off.
They dismissed the idea of using a breaker, and used a sledge and a 6ft iron spike, and made the concrete look like stale sponge cake.
Then they chucked it on my Agapanthus.
I've been chiselling out backboxes with a scutch and a lump hammer. It is not my favourite job.
Doing a massive lump of concrete like that certainly doesn't appeal!