If able,see if you can read data with hp tuner should show approximately 2 ohms for each air bag and each belt pre tensioner also check for airbag codes which will give a more defined cause of fault flash code is general cause only

When checking drivers pre tensioner there is a bridge link built into the harness side plug that you need to open up with the tip of a small cable tie before connecting a 2 ohm resistor across the wires from harness and recheck flash codes

Try a replacement seat belt pre tensioner on drivers side
after checking connection to passengers pre tensioner in case the manual was written in America

I just moved the AU to jack up front to see what else it needed and after I started it up to move it back and noticed the light wasn't flashing so put on the seatbelt and no light flashing,I was looking at it to work out what I needed to do with it but I didn't think I touched anything-will probably still change it but curious maybe wiring or plug??

hard to say without pulling it apart to check & i'm thinking plug but may be wrong .