TBH what worries me here more than anything else is the competency of the "electrician", can't understand the basics of connecting a fitting that has only 3 wires, I would be a bit more sympathetic if it was a case of connecting a stand alone pir to an existing fitting. A standard fitting has 3 connections, L = live= either brown or red, N = neutral= blue or black and E= earth = green/yellow or bare copper with a green and yellow sleeving, it's not rocket science, as for the fused spur, well that only acts as a point of isolation if it is switched on then the fitting should work, assuming that the bulb isn't knacked or not located correctly.
Sorry to be so savage but I'm getting sick to the back teeth of people just diving in and thinking they are electricians. I was at an event recently and my mate and I were looking at test equipment on a stand, between us we had every bit of kit they were selling, the guy asked what we did as "with that amount of kit you can't be normal electricians" to which my mate replied "no you're right, we're proper electricians!"
These days everything is specialist, "oh no we don't do alarms, cctv, access control. etc, that's specialist" is the common cry. Well no actually it isn't, Back in the day an electrician did every aspect of the job, this "specialist" attitude is just a cover for a lack of proper training and a justification for selling more courses and such like.
