Well set about this morning changing my Vauxhall airbag for an Opel one. Read the how 2's on how to do it (very useful)
Its a pig of a job really but after about 30 attempts I got one side unclipped and about another 50 attempts to get the other side done.
No explosion's and no airbag light on afterwards so i'm a happy chap.
Big thanks to Soulman for telling me who to get in touch with and big thanks to Sebastian for sourcing the airbag.
Here it is.
Just need to change the bottom cover for an OPC one now and the opelisation is complete.