OK, all earth wires conected together and light up and on before darkness curtailed efforts.
Thanks very much for your help on this one - appreciate your time.
Just had a further look and you're suspicions are correct - two of the E wires are very thick at one end (thin at other) and yes, this is a bathroom light.
Please could you clarify how'd I'd add another earth conductor to the light earth wire ?
I'm presuming if I left the thick E wires as...
I've one final light to fit in a new flat and have discovered along the way various permutations of wiring in the wall cavities - this one's stumped me though.
Purchased light fitting itself has wires for L, N and E.
Wall has two L's and N's, each connected to L and N in wall connector...