wiring light fitting.

[rotradrive]

have coming from the ceiling 2 red wires 2 black wires and 1 black with red sleeving,where does the black with red sleeving go

[cleggie]

normally that is used to indicate that it is areturn live wire from the switch.
usually a 2 core cable is used consisting of a black and a red wire.
so to mark that it is in fact a live wire and not a common one it is marked in some way ie red sleeving,red tape etc

[cleggie]

normally that is used to indicate that it is a return live wire from the switch.
usually a 2 core cable is used consisting of a black and a red wire from the switch to the ceiling fitting
so to mark that the black wire is in fact a live wire and not a common one it is marked in some way ie red sleeving,red tape etc

[buildersmate]

Look at the upper picture under the section titled 'Two Wire Method'.
http://diydata.com/planning/electric_lights/el ectric_lights.php
(scroll down the page)
Your 'black one with the red sleeving on' is the one on the left of the diagram, the cable coming from the switch (it is not shown with sleeving on in this diagram).