Well, disconnecting the battery made no difference, seat back off, connector off, quick spray of cleaner and reassemble, and jobs a goodun.
I give up, ill just do this every now and again....
FYI
Measure, Original data, after disconnect, after connector reseat
System Voltage 13.59 V 13.98 V 13.79 V
System Voltage Status Okay Okay Okay
Airbag Configuration Side Airbags Side Airbags Side Airbags
Pretensioner Configuration Driver&Passenger Driver&Passenger Driver&Passenger
Driver Airbag Squib Circuit Resistance 3.13 Ohm 3.03 Ohm 3.05 Ohm
Passenger Airbag Squib Circuit Resistance 2.17 Ohm 2.12 Ohm 2.10 Ohm
Driver Pretensioner Circuit Resistance 2.59 Ohm 2.61 Ohm 2.56 Ohm
Passenger Pretensioner Circuit Resistance 2.43 Ohm 2.41 Ohm 2.41 Ohm
Driver Side Airbag Squib Circuit Resistance 5.15 Ohm 5.15 Ohm 3.42 Ohm
Driver SAS Message Status (Side Airbag Sensor) Okay Okay Okay
Passenger Side Airbag Squib Circuit Resistance 2.46 Ohm 2.43 Ohm 2.43 Ohm
Passenger SAS Message Status (Side Airbag Sensor) Okay Okay Okay
Reset Passenger Side Airbag After Activation (DTC69) Inactive Inactive Inactive
Reset Driver Side Airbag After Activation (DTC68) Inactive Inactive Inactive
Reset Pretensioning Devices After Activation (DTC67) Inactive Inactive Inactive
Driver SAS Initialisation Status (Side Airbag Sensor) Okay Okay Okay
Driver SAS Communication Error (Side Airbag Sensor) None None None
Passenger SAS Initialisation Status (Side Airbag Sensor) Okay Okay Okay
Passenger SAS Communication Error (Side Airbag Sensor) None None None
DTC set since 21000 21000 21000