Hello all, just an update on the airbag ECU. Sourced a replacement from a breaker, the same model and year, for £25. Removed the battery and left for 2 hrs. Removed the trim panel located between the centre console and the dash, folded the carpet back on the left foot well and removed the round clip from the right foot well - then pull from the front to release from the two front clips on the panel. The ECU now sits in front of you. Three yellow connectors in a line, with the square ones on the left and right being the sensors and the one in middle feeds through to the main car ecu. Remove the connectors by pushing down the retainer lug and pull back, noting the sequence. Unbolt the four torx bolts, easy for the front and fun for the back, Now simply replace with the replacement unit and reverse the steps back to reconnecting the battery. So with keys in hand this is the point that had me wondering. Deep breath and ignition on. Airbag light on and with the car running, imagine the surprise when the light went out and everything settled down. No bangs. No codes to clear down. Just a car MOT'd at 4pm and a clean pass.