Any upgrade and/or improvement to the mains is generally worthwhile particularly to the earthing.
But beware IEE Regs which seem to alter each year.
I go round the house with wire wool and clean and deoxit earth bonding points and retighten or replace.
Cheap and sounds OK after
Lumley Heliosphere Audiomods 5
Voyd Valdi AN Arm 1 V2 and Denon MC
Audiomeca Talisman Highly Modded
Audiomeca Kreatura &,SW1X DAC1
Hovland HP200 MC
Hovland Radia
Ming Da 805 monos
Magnum Dynalab Etude, RWA Cassabria + LCD 3
Wilson Benesch Actors
Cables by Cardas, Hovland G3 and Yter