Switches fitted:
If you're using mk1 wiring, the AC switch fits with no modding. The Recirc switch has different keys, but is easy enough to doctor with a scalpel (note pinouts are identical for the switch sub-loom):
Wiring: John (Jack of Hearts) very kindly sent me his TF AC body loom which I've stripped back all the dross so here's what's left with labels. (Ignore the fog light parts - that's because he has a poverty spec 160!) It turns out the TF & Mk2 is entirely integrated with the body loom. The mk1 has a seperate front bay loom as pictured earlier (join is where the red line is)
1: Trinary Switch (on dryer)
2: Relay Pack
3: Fusebox connections (x2) - only one on my MGF loom which I need to investigate
4: Fan Connections (x2) - on MGF loom this has a separate connector to plug into the existing fan connection. For TF/mk2 F this replaces it. (John, just unplug your old one and tape it up)
5: Connector to Switch Sub-Loom - connects just above evaporator
6: To dashboard feed - I'll add pictures later showing which pin once I've done the rest of my car loom
7: To ECU/Engine Bay. 4 pins to go into small ECU connector, 2 to go into one of the other body/engine loom interface plugs.
There's also couple of earths up near the front fog wiring.
As you can see, it'll be significantly easier to add this to an existing car, rather than swap the whole body loom.