update, i have now identified 2 'live' cables that form the ring, I have also identified the cable that goes to the light in my cellar, so the 2 lives are in a COM terminal and the light in the FL2 terminal, whenI swap out the L2 terminal for either of the other 2 wires the circuit trips, if I just leave the 2 lives in the COM terminal all the other downstairs lights work apart from the cellar and the kitchen. One of the rogue wires is for the light in the kitchen so I am assuming that there may be something wrong with the light fitting or bulb but still not sure what the other wire is for!!