+1
I'd msg around and see if you can borrow a sledge hammer, then see what happens.
If it turns out to be really stubborn then get one of those massive Titan SDS. But it doesn't look like a huge area.
I've not found SDS or even Kangos can compare with a sledge hammer or lump hammer and cold chisel / bolster.
Sometimes stitch drilling really stubborn lumps can help though.
@NotThamesWater started
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+1
I'd msg around and see if you can borrow a sledge hammer, then see what happens.
If it turns out to be really stubborn then get one of those massive Titan SDS. But it doesn't look like a huge area.