Alberto.
Thank you for the information. This is not a problem as I want to do this up correctly. As a matter of fact it looks like your advice may save me a lot of time as if I am looking at things correctly, the torpedo carrying aircraft appear to be the ones that are olive green overall.
I have ordered the decal sheet you have shown and work will pause now until it gets here. A quick respray of the engine cowlings is a nothing to do.
Cheers,
jeff