Thank you Grober and whitenemesis!!
So finally found the solution. Thanks for your input!
Whilst mechanics were quoting me >£1k to open the transmission or engine...the answer was very simple: a fuse issue.
Changed around the fuse in passenger compartment side and fixed the job. Gears
lever happily communicates
Now I need to go back and fix my original issue:
LEFT WINDOWBAG MALFUNCTION, CONSULT WORKSHOP.
Using diagnostic kit it shows:
DTC ERROR "B002113 - THE SQUIB FOR THE LEFT WINDOWBAG/HEADBAG HAS A MALFUNCTION. THERE IS A OPEN CIRCUIT"
It's a UK vehicle so left side = passenger side. Checked the fuse for sure this time again. Checked connectors under seat thoroughly also. Still will not reset with diagnostics. Bearing in mind this airbag warning has been there for months. Tried removing the battery terminal hoping to reset but no luck.
Any advice?