Geoff,
Reference to the TRW system is to help you select discs and pads that are going to be compatible with the brake caliper set up on your car (e.g on the 4.2 SC the factory fitted brake calipers were Brembo calipers on the front of the car and TRW calipers on the rear of the car).
So, if you were planning on buying, for example, a Brembo brake disc and pad kit from AF, reference to that kit being for the TRW system just means that the Brembo disc and pad kit will be compatible with your original TRW brake caliper set up, if your car is fitted with TRW type calipers.
Hope that makes sense 
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