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It can be a bit more complicated as your existing switch is often a hallway light and there is no one constant live since the hallway light will be 3 way.
In the past I've had to take a lighting circuit live from the nearest point in the ceiling and run a switch line from pir to the switch which is just about as big a pain in the ass as it can be.
As far as regs for exterior lights are concerned you need to be going straight through the wall into the fitting with no other external wiring to avoid having to have it signed off. Although most people would overlook something that innocuous.
Airhead
@Colm89
Would like to fit a PIR sensor front light where there is no existing external light. There is an internal light switch for internal lights on the opposite side of the wall I would like to mount said light.
Is it a case of drilling a hole straight through the wall and taking a constant live off that going to the light switch?