I'd seriously doubt foam there on a short run of cable would make any
difference at all, indeed because its quite easy to dig out one would not
really have aan issue to get at the cable.
Brian

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On Monday, 12 October 2020 09:51:58 UTC+1, Tricky Dicky wrote:
My supply cable emerges out of the sub-floor and passes through an
approx. 50mm gap between the first joist and the wall. However the
run of the cable is not vertical due to the alignment between the
entry point and the cutout the alignment is approx. 150 - 200mm out
and the result is that the cable forms a lazy S in the space between
joist and wall. This makes sleeving impossible.

Move the cutout? :-)

Just squirty foam it and say it was like that when you moved in.

Owain