hello was wondering if you could help me ,if when wiring a security light through a switch would it be possible to wire it so that when the switch is open the light would work normally (ie through the pir ) but when you operated the switch the light would come on as a normal light.the answer im looking for is not a light with an override facility but possibly wiring the light from the switch via 3 core and earth ,the common connected to the pir side and the switched live connected to the light side.

If you want a light unit with override function you need to buy one, you should not alter light fitting's but instead buy one suitable for the task

If it only has 3 terminals it's likely it doesn’t have override function, however some light's will allow you to manually override them by switching their supply of and on 3-times (as scotspark said), look at the manual to see if this is possible, if it is you may supply the light with 3-cores (Live, Neutral, Earth) and operate it as you want using the switch following the manual

e.g.

switch on and off 3 times = constant
turn off for 60 seconds and then on = PIR mode

or other similar variation

Surely that is a unit with overide function  ???