Holdsworth frame identification help needed

[nvmat]

I have just acquired a Holdsworth frame and am trying to identify it so I can build with appropriate components. Frame no.066857. Interestingly it has internal cabling on top tube , in at one end and out the other. The person I got it from said previous owner had it taken to a special place in Derby. I am wondering if it has been resprayed at Mercian cycles at some point as the 531 labels look newish and no Holdsworth symbol on front stem. Mix of components but bearing cups on front stem are campag, original I guess. Any help identifying appreciated!

 

[grumpus]

The fact the 531 sticker says "renovated" is a clue to the paint, that style of sticker was supplied 1989-94 but could have been used later. The serial number suggests this is a 1985 build. The internal cable route could have been added when the frame was resprayed, so that's no clue to its identity. The lack of a boss on the brake bridge suggests it's a lower cost model. My guess, and it's only that, is it's a Triath-elan, a 531 main tubes and fork blades model. Anyone please feel free to correct me.
PS what you call the "front stem" is the head tube.