Hi Pelect,
Thanks again for the reply. Actually, the switch does work but partially and I have isolated the live wire as well from the rest. In method 2/3/4 of my hand written diagram, 3 switches out of the 4 work normally. I am able to power on and off the lamps but as soon as I use the 4th switch the rest of the switches power off. When I say power off it's not a trip of the ELCB but only all 4 lamps turn off. Nonetheless, I shall heed your sound advice and will engage an electrician soon but in the mean time, any further suggestions much appreciated. Thanks and God bless.