Anyone any idea of how to find out the exact fare basis code on a ba.com booking after it has been booked.

By fare basis code I mean the 3 to 8 character alphanumeric code that is unique to the fare and its restrictions, for example J2BALCY, not just the fare bucket (i.e. J, D, I, F, A etc.)

It doesn't seem to be available in manage my booking, nor does it seem to appear on the e-ticket, although it used to be on the e-ticket