Thanks Joe for the prompt reply. I can't remember exactly where I got it from, but the diagram I used is below (it's upside down so that it aligns with the photo I took). This is also what I've seen on a few YT videos. Clearly it doesn't work though!

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After reading your post I went to wiring diagrams on my pup website and they are pretty much what you've described:

Standard tele:
http://www.irongear.co.uk/2xtele_sc_..._blade_v08.gif

My pup combo but with a different swtich:
http://www.irongear.co.uk/1_x_humbuc...e_v01_igwm.gif

I'll make the updates, but are you able explain the differences?

Also I assume the treble bleed goes in the same place, i.e on the volume pot between the switch input and jack output?