YorkshireTyke,
Aaah, the trouser story! As I heard it, the captain in question was Captain B Prxxxx who very much liked a smart appearance, wearing immaculately pressed trousers, he kept said trousers in his locker in 221. (221 was the reporting point in one of those prefab buildings on the North Side of London Airport, as it was known then).
Another captain, a large genial man (let's call him Captain Jxxxx Jxxxxx) was fond of practical jokes and decided to hide the trousers in another locker. Of course, as expected, Captain B P hit the roof and refused to take the Monarch service until they were found. How long that took, I have no idea, but I do know the flight was delayed for some time.
Despite what has been said about the NABs, there were some lovely blokes amongst them, very good pilots and good commanders.