Hi, with the new part �P� of the building regulations you are only allowed to do certain diy electrical jobs yourself without plans and a certificate of compliance. Fortunately this is one you can do. Right so you want to run lights from a spur? Hope fully its from another light or part of the lighting radial circuit. If it�s a spur from a ring main (that�s the sockets) then you will need to use a fused (5AMP) spur. You will need 1.5mm twin and earth cable. Run cable from spur to the first light fitting in the ceiling of that floor, it enters the ceiling rose where it is looped in and out to feed the next light, etc etc. At the same time a cable is connected into the ceiling rose to the switch that controls that light. With ordinary "one way" lighting, ie one switch controls only one. To see how to wire up the ceiling roses go to this web site
http://www.diydoctor.org.uk/projects/replacelightfitting .htm and look at the diagram. Its not to hard to do but if your in any doubt don�t do it cos lets face it electricity can kill.