Remove your clocks , split them and cover the smd/ airbag light with black tape then rebuild,Take the bulb out.
For an mot the light must illuminate and then extinguish so it would still fail it's just as easy to get it reset any decent diagnostic machine will do itRemove your clocks , split them and cover the smd/ airbag light with black tape then rebuild,
Hopefully this may then look like it's not showing a fault,
May get you through the MOT but really needs sorting if it is a genuine fault,
Have you checked the plugs under your seats?
As on some D's if you run the seat fully back fast it can pull in the plug causing the airbag error on the dash ,