Maxi - thanks for your helpful contribution...I knew I could rely on you. Cheque is in the post ...
Softie - thanks for your more useful advice and confirmation of my understanding. The problem I have come up against is that some web publishers seem to require release forms due to perceived crown copyright or reject them for 'trade mark' reasons.
I was hoping that there might be some legal jargon available that provides me with the backing to sell MY photos of military aircraft without fear of breaking MOD ownership / copyright legislation....or am I missing the point??