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!
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?