I worked for BEA then BA as a mechanic at Glasgow in the 70's and found that a high percentage of Trident captains were arrogant and ill-mannered to the ground staff.It was so bad on one occasion that I complained to my shop steward and was told to inform the captain that if his manners did not improve neither he nor his aeroplane would be going anywhere. This resulted in an apology and the excuse that his flight manager was giving him a hard time.