At the side of my house there's a rainwater drain that, being near the
outside tap and hose, tends to also get used as a general drain for
waste water (only water though, nothing nasty). However, around the
drain itself is basically just mud. I'm considering slapping some
concrete around it to form a kind of shallow funnel and to fill in a
manky muddy gap between the house wall (below the DPC), the boundary
garden wall, and a piece of concrete forming part of a patio (it's a
complicated layout). About half a square metre of concrete.

In the same area, though, is a run of SWA that supplies the shed. It's
clipped to the house wall, the side of the patio, and then to the garden
wall to run down to the shed. This new concrete I'm planning would be
poured over part of the cable, so it would come down the house wall into
it, then emerge up the garden wall on the other side.

I don't expect to need to modify the cable. Any reason not to just
concrete it up as proposed?

Cheers,

Pete