SASless,
Note that these were purely military convoys in the Baghdad AO not logs convoys along the MSRs and also note that I did say this was personal experience over a protracted period - I did not say that no Brit convoy was ever subjected to an incident, just that no Brit convoy I was on was subjected to an incident.
Pointing a .50 cal does put the wind up an enemy but it really irritates a friend
At the risk of telling you a war story, the most irritating thing a US trooper did to me was to shoot the front tyres of my vehicle out.........and my vehicle was part of the convoy he was protecting...... 'twas a few stray shots from the full magazine he decided to fire a nothing in particular!!
We did have words afterwards!
When I was there the US had full responsibility for the Green Zone however, that may have changed to some degree now.