Thanks frank, much appreciated. I did have a good rummage around when I got the ecu and loom out (pig of a job getting the tails through the bulkhead). There's a box bolted in front of the ecu, looks like the airbag controller?
I know from other engine swaps theres sometimes an immob ECU, so I thought it would make sense to ask!
Trying to figure out if there's anything else I should take off the car before I call it in.