You could either take the feed (live and neutral) to a junction box and take 3 cables to the switch using brown as live feed and blue (with brown sleeve) as switched live, then run from the junction box to the lights
or
take the feed directly to the switch (COM) which are all linked together as you suggested,
put the neutral in connector block, then
run 3 cables (one to each row of lights), connecting brown to L1 in the switch and blue in the connector block behind the switch.
Personally I would go for the second option - with the first you would have a load of connections in the ceiling which isn't really practical unless you live in a bungalow.
Remember if you install a new circuit back to the board you will need an electrical installation certificate and building control would have to be notified.
Adam
February 2010