Anyone wanting to do this conversion the Jeremy fearn way is now out of luck. I just called them, and got a pretty cold reception from I assume his mother. He has apparently moved to very large international company, and no longer does ecu work. Which doesn't make sense given he has multiple outlets etc,
I wasn't given the chance to explain, as the lady asked to cut me short and say goodbye,
Iim looking at doing this but mating it to the 4hp24 hopefully using ashcrofts adaptor plate (awaiting a reply from Dave), or using the entire BMW setup including box, and using rakeways remote lt230 adaptor to link the box to the transfer box.
The other alternative is to custom build the bellhousing on the bench, but I want to avoid if possible.
As I understand it, striping the car of the loom, and anything sensory, whilst retaining the BMW auto box will allow "standalone" usage without fearn's electrickery (albeit far more involved and time consuming.