10mm PE-X pipe

[rossoreed]

10mm PE-X pipes being dropped from the ceiling to a radiator below.
What's the best way to bury the pipes in the breeze block wall, should a plastic conduit be used, or can they be simply recessed and plastered over?

 

[compheat]

Use 10mm plastic pipe duct into wall then cover with metal tape so it can be traced with a stud/metal detector.
you can also buy a fitting/wallplate for the pipe work to exit the wall behind the radiator.