Hi all I'm a newbe to this so bare with me, so the problem I have is this, my partner wants a new light in our bathroom so I'm no sparky anyway I take the old one off to expose the wiring and it all drops to the floor, well now I don't know what goes where, there are basically 3 grey cables each containing 1red wire, 1black wire and 1 without a sheath if that's the correct term I presume it's the earth, so this new light shows on the diagram live, earth and neutral so how do I wire it up, I will post pics if needed I just wanted some reassurance that it's not going to be a case of calling someone out so please give me a clue I would be grateful Thx.  

Quick pic:

Note the little red sleeve on the black wire from the switch in the image above. That might help identify the switch cable.