in main light u will have 4 reds, 4 blacks, 4 g/y(earths). the prob seems to me u are gettin switch wire wrong as this wil be black instead of red(live). quick way is to put all reds together in block, separate all blacks(not touching). get urself a volt stick or volt indicator from b+q or somewhere turn on supply. now without touching any cables with bare hands put volt stick to each black cable, 1 of them shud light the stick. if so make a note of which 1, isolate supply put the 3 blacks together an the 1 black(that lit volt stick) to the live side(brown or red) of light but also if u know which cable goes to other light then u need to take that red from the bunch of 4 reds and put that red to that single black on live side of light. once all connected switch on. if its the fuse or main swich u hav been blowin then this shud solve it.
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