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You could dry-pack this gap.
3 x sharp sand, 1 x cement, mixed with just enough water to be able to form a ball when squeezed in your hand... not wet like mortar.
Ram this in the gap, and tamp as tight as possible. This will be acceptable to fill that gap.
This method is used in some underpinning.
Thanks for the reply. I had read about dry packing but didnt know if that would work at the 10mm end of the gap?