Hi all. I'm a bit late to the party discussion on this subject but if I could just add. I used to work in the motor industry on DAF trucks. DAF trucks I hear you say , how is that going to be relevant. Well in wiring terms it is very similar, as the designers of DAF wiring looms many years ago decided to encase all the wires on the chassis in flexible plastic trunking which in practise sounds good . Until the said truck gets a few thousand miles on its back and the vibration from the road and engine / transmission shakes the loom to the point where the wire shaking against the hard plastic convoluted trunking got rubbed away , baring the copper wire until it breaks. Add to this the salt on the roads in winter and you get an avalanche of electrical gremlins. In one particular case I remember a DAF 75 where the driver reported that every time he put the R/H indicator on the A/B/S light illuminated! I have personally changed dozens of looms on trucks where several single strands of wire had just rubbed away inside the protective plastic trunking. 
I have a TF ( 05) plate which I have owned for 9 years . One of the first things I checked when I bought it was the boot hinge loom which turned out to be fine when I pulled the wires from the trunking. The first clip on the boot hinge had not been fitted so I think being a late registered TF I think it likely that this had been done on the track at Longbridge. I sprayed a liberal amount of silicone lubricant down the trunking to help the wires slide inside when opening and closing the boot. 

John

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