As far as I know the 155's in Nigeria haven't been released. If you read the topic about news in west africa it mentions 2 139's have been delivered but not used commercial...
This is one of the reasons why I wonder if anybody else than the current contract holder (bristow) can start the contract from July onwards but who knows.....?
The contract is now flown with 3 - 4 aircraft? From norwich and den helder.
Would be interesting to see if this will remain the same and if aircraft type used will be 155.