Thanks for your responses guys.
My window switch has three pins too, so i'm guessing it's just a matter of its firmware. Internally it seems like a remote and there isn't anything obvious missing, or any blank spots that would give it the powerfold function.
I'll be adding the missing wire today as i just received the needed Dupont terminals... I'll also order the switch so i can test once it arrives.
If anyone closer to Manchester has a UCDS adapter it would be great, alternatively, i'll eventually bug Terry for that.