I have official feedback which states that the mil aircraft was operating within the rules. Perhaps due to the highest recorded level being 200 ft below the base level, however the addition to the feedback was that aircraft CAN operate at the base level at right angles - but these aircraft were flying down the centreline of the airway head on to the GAT so I don't understand that point. Oh well, thanks again for the replies. This is just another area of ATC where an injection of a little common sense would work nicely but that doesn't seem possible. The interface between mil and civil seems a little lacking at times. We share these problems, appreciate each others difficulties in the working environment and then nothing useful seems to be done to remedy the situation.