In lowering paving height I will have to hack out an SWA cable run
through concrete, I don't fancy my chances of chopping it out intact,
it may need replacing as a result (and run in flex conduit). SWA fc is
thus:

CPD -- radial -- two SFCU side-by-side -- 20mm malleable besa 1-bottom-
outlet box -- one 5c SWA to jn-box outside -- 3c SWA to light & 3c SWA
to shed on sleepers (Class-II appliances).

I dislike the requirement to isolate two SFCU to isolate the jn-box
(dymo labels peel off) re Darwin Award.

Worth switching to two 3c cables? Easy to change besa box to 2-bottom-
outlet, one 3c to light, one 3c to jn-box.