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OK new drawing.. I'll use my numbers and letters..
the switches ticked are working correctly yes?
right..
switch 4, cable A goes to switch 8 cable E or F?
switch 8, cable E or F ( other one to above ), goes to switch 6, cable C?
switch 7, cable D goes to the under cupboard lights?
now.. with the ends all made safe into terminal blocks, turn the power back on and set the multimeter to 250Vac..
do those wires have earths? are they connected to the backbox?
if they are then put the black lead on earth and test with the red lead on all of the reds, including the one in the com of switch 4
make a note of any that are 230 or more volts..
now many holes in switch 8?