How many people connect to a ring main for their system power,I use a 30 amp signal cooker cable from the consumer unit to a block of stainless steel front and back boxes,round pin heavy duty MK unfused plugs.which I think makes a big difference to my system .the block of sockets are from a well known shops power block that powers there mobile food freezers,they are linked together with 30 amp cable and have a stainless steel mounting plate with a separate earth spike to the stainless mounting plate of the block of sockets the only fuses in the line is in the c/unit and the iec (kettle)socket on the back of the amps and power supplies etc.the mains cables are all soldered to the three pin plugs,also I do not use any homepage for the Ethernet  devices I.e streamers,satulite box,has box or network media tank,no net gear switches just singles rj45 cables to each network item.l found using home plugs and switches caused interference through the phono boards and stylus.every thing apart from the projector and the pio tv is plugged into the stainless steel bank of sockets also subwoofers and AV system are on a different mains cable.have I went to far lol.