My airbag light came on for the first time about 6 months ago.
Read the forum, did the slide the drivers seat back and forth thing and that solved it.
Kept coming back on and sliding the seat kept getting it to go off.
Then about three weeks ago came on and wouldn't go off by moving the drivers seat.

Read the forums again and found one which said that the seat SRS circuits were earthed through the seat runners and this could be affected by dirt. Looked at the wiring diagrams and couldn't see anything earthed through the runners, seemed to be a bit of a long shot to me. Read the service manual and found that there was a Hall effect sensor on the drivers seat rail that tells the SRS module the position of the drivers seat. The further back the seat the airbags deploy at a different level, clever stuff. As far as I could tell this was the only SRS thing in the drivers seat apart from the seat occupancy sensor. There are no seat airbags as with the discovery.

Took the car to an indie. He plugged in the computer and came up with open circuit (ie broken connection) on drivers SRS circuit.
Took them an hour to find a broken wire going into one side of the block connector under the drivers seat.
Repaired this and fault code and light out.

Good write up - thanks