Pull cord light, ceiling fitting needs replaced?

Rewiring new bathroom ceiling fitting?
Help please someone. For 3 ceiling spotlights in my bathroom, added 4 years ago during new home extension.
My wires are Blue, Brown and Green/Yellow stripes for the Earth.
The fitting was 4 years old, and was a straight line with L1,(Blue???) L2, O and the Earth symbol
I have a new box from Wilkinsons which has L1, L2, COM in a kind of rectangle. What one has which wire and where does the Earth go?
No symbol on box.
Help???