Robert Irwin wrote

Need some kit for making a better appearance to my cabling work, I'm after
kit for digging grooves into walls so I can bury a couple of power cables
in the walls before being plastered over again. Having trawled
various DIT sites I've come across horrifically expensive 'wall chasers'.
Are these the best bits of kit for the job, and anyone know good soures of
them? Or for a shallowish groove in wall is an angle grinder okay? Also
wondering if anyone know of tools for digging holes to fit flush-mounted
sockets out easily, or is it just a case of whacking away at it with a lump
hammer and chisel?

As it's a new house maybe the walls are built of Thermalite or Celcon blocks.
If so they're so soft you can almost do it with your finger nails. I'd have a
go with a hammer & chisel first before buying expensive gear.

Peter