OK Becky here we go.
The grey cables carrying the red, black and earth wires are the 'loop ins' and they come from one lamp in another room to your bathroom, and they then continue to the next room. The cable which has the 2 red wires goes to the switch - it takes one live from the loop, down to the switch, then back again to the bulb holder...catch my drift? Therefore to get your fitting to work, you need to provide the bulb holder with one black connection - the neutral - and one red connection, that is, the live coming back from the switch! Looking at the ceiling rose, the centre two brass connector blocks contain the loop connections, and the one at the side holds the live connection back from the switch. Phew.....
John
July 2009