Thanks for your help. There was no earth with the other two wires but i've been advised that it may be attatched to the actual box in the wall and i may of missed it. but to fit to a chrome socket the earth needs to be attached to the socket? it does have a fixture for this.
I am changing a one gang one way plastic light cover but have bought a two way chrome replacement can this still be used? Also the two wire is a red live in and red live out where will they need to go? And finally i cannot find an earth do you think this could be wired into the case? Please Help