RobboRider thanks for the info, sounds like you fly in similar conditions even though you're 6000 miles away.
To me it sounds like it is the PIC's responsability at the end of the day. If you sign an indemnity form on delivery and don't notice contaminants its you're a** they will want.
Hopefully I can furnish my CAA with 1000 pages of literature on the subject so I can operate fron the bush again.
Thanks again