Hi again

I'm putting plumbing it for a power shower (again!).

As I can't get easy access to the floorboards I'm thinking of just laying
the pipes from the airing cupboard into bath panel space (which is just
behind the airing cupboard) hook up to the pump and then on to the shower
cubicle in the next room but parallel to the bath.

The pipes would run along the the top of the floorboards (out of sight
though as they'll be in the bath panel void).

Is this acceptable?
As the pump is in the beneath the bath in the void area, is it ok to run the
electric back to the airing cupboard to be connected up (by a pro sparky,
I'm well aware of Part P)?
I spoke to salamander and turner pumps companies and they both say 22mm must
be used as inlets for a power shower, would plastic pipe and push fits be ok
for ? I know that I can't use plastic push fits near the Sussex flange due
to the heat.

Thanks for all your help.... again!

Matt