hi guys, thanks for your input.
i ordered this https://www.amazon.co.uk/gp/product/B017HRYD42/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
£20
and have just changed it over, cleared the error with my b cable and bingo! no more air bag light.
fyi, its easy to get at, picture attached. move...