Single stage demister - loom

[Joelipol]

I am looking to reinstate my rear demister and understand there is a loom going from somewhere around the cdi box area up through parcel shelf into the window surround. Does anyone have a photo of this loom or of it in situ? I don't think I have it and will probably need to make one or buy one from somewhere.

My car is fitted with single stage demister switch in the dash and lights up when pulled but alas nothing is connected and the screen I originally sourced had no demister. With that solved I just need a way to wire it all up.

Help and guidance very much appreciated.