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40mm corrugated conduit for cables in cavity wall?

I'd like to shroud the mains cables (about a dozen mixed 2.5mm and
1.0mm) passing through a cavity wall prior to the installation of
blown/pumped cavity insulation.  I sense this may be an awkward task
in itself , but want to simplify the upcoming rewire by having a
clearer path for the cables, and not have to worry so much about
derating them all.

The stuff that will be used is apparently some kind of silicone/silica
coated fibre that will 'pack'.  Would it be better to let them do the
job and then just pull it out from that section that the cables pass
through?

Plan A is to demount the cables from the CU, push a suitable size of
conduit over 3-4 cables at a time, and feed this through the first
leaf, then the cavity (about 300mm vertical offset :-() and then the
hole in the other brick leaf.  May then pop a bit of expanding foam
around the outsides to finalise filling and secure all in place.  And
finally reconnect the cables to the CU.

But I can't find a supplier of small amounts (say 5m) of suitably
sized flexible conduit (I have 35-40mm in mind).

Can anyone propose an off-the-shelf supplier, or a different plan?

TIA
IanC

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