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Also the voltage drop values from 7671 are calculated on the cables maximum operating temperature so if you correct the values using the formula on page 258 of the BRB the voltage drops become even lower. Works out something like this: Since we're being picky ;)

[quote name='Andy

Thanks guys!!! When you put it like that it makes perfect sense.

Ok. I've been trying to get my head round this all day but I'm getting nowhere. On page 45 of the OSG (Table 7.1) it says the maximum length of a lighting circuit wired in 1.5/1.0 cable on a 6 amp Type B MCB is 90 meters. However, working out the voltage drop for this length of cable I'm...

Can't grumble

I agree with D Brenan, Run your feed from the CU to the first spot light in one end of the room. Then run a feed from that light to the first spot light in the other end of the room (No need for junction box). Now run your 2 switch wires from these points to the dimmer.