OK, so I've got a second transmitter which I've managed to bind Azriel to and that works fine. Batteries all charged and is good to go. In typical fashion however, Jibril is being the problem child. I got the wiring soldered back up but must have done a dodgy solder somewhere as when powered on, it started to turn on and then sparked with a bang.

I really hope the speed controllers et al are OK. I'll find out when I dig out the entire wiring loom tonight.