I know nothing about AD fares and conditions except that they are space available - however, in the past (I don't know if it still applies) travel agents on AD75s took precedence over staff.

What I do know is that the definition of simpering is "smile in an affectedly coquettish, coy, or ingratiating manner". Since this clearly took place over the phone, I would doubt strongly that the agent was coquettish with your colleague - indeed I would even doubt that they were obsequious. Such has never been my experience of any part of British Airways in the UK. Unless you were party to this conversation, how could you know? and indeed if you were, why didn't you get them to pull up both locators and check the facts. If he got it on the same fare, so should you. If this is an error, then it needs to be rectified.

i would suggest that if haven't done this, that you and/or he, or your corporate travel department to inquire why this difference between the bookings exist.