Same problem as at least one other reviewer - bought this supply as the recommended one for 2 low power cabinet lights (http://www.amazon.co.uk/gp/product/B004BCVM96/ref=oh_details_o02_s00_i00) but the lights are incorrectly wired so I had to reverse the polarity of the connecting cable to get the lights to work. Fortunately I was electrically savvy enough to spot this and be able to correct it but I shouldn't have to.
This pack was bought to power the same supplier's LED downlight (reviewed separately). The pack consists of two items, a transformer connected to a distribution box, and a mains lead. The mains lead plugs one end into the 240 volt mains and the other into the distribution box which then gives you the option of connecting and running up to six LED down-lights. The pack comes with no instructions whatsoever and therefore contravenes EU consumer safety standards. The connection of the two supplied items is straightforward. However, the LED unit comes with small wires which are intended to connect into the distribution box but there is no indication of how you are supposed to do this. I noticed that one reviewer soldered their connections and for this you would need a very small soldering iron and a lot of care in order to avoid melting the plastic around the connection receptacle. I actually managed by crimping a small spade terminal onto each LED wire and cutting one of the spade prongs off, then jamming the other prong into the distribution box receptacle. I have made it work and the light is excellent but I am afraid I cannot recommend this connection pack at all and would suggest that Amazon ceased to supply it.