here is my take on it: Originally Ht leads were copper, they played merry hell with radio and tv as the high energy transients were effectively a spark transmitter. These leads have not been used for donkey's years, nearly all leads now are made of a conductive carbon core that has inherent suppression characteristics. In other words modern leads don't need suppressors because the resistive carbon is itself a suppressor. When I last did SVA the inspector had some sort of device that measured the RFI (radio frequency interference) My car passed ok. I think the rules are there for copper wires and possibly old points based ignition systems which emit all sorts of nasty radio interference if the condensor has gone. If your wires are all sort of floppy (very technical, I know ) then they are resistive carbon and should be fine, it they are quite rigid they are most likely copper and they will fail. My leads were not marked but other testers may be a bit more pedantic than mine was.
end of sermon.
Enoch
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