Certainly nothing unusual in days gone by. Often slipped in opposite direction landings & take offs with a/c we could trust ie knew the score & knew what they were doing. Same happened frequently with calibration a/c - they always seemed to want to do the out of use ILS on the opposite direction r/w. Also, at Aberdeen, we didn't have ILS on 35 & in lowish vis & cloud ceiling conditions with 35 in use IFR arrivals made ILS approaches to 17 followed by visual circuits to 35. We handled 400+ movements , nearly all IFR, per day; so it was quite eventful & enjoyable getting 35 departures away in the teeth of 17 ILS arrivals to a visual circuit to 35 ! Also, the noise abatement procedures stated that all arrivals were to be on 17 & all departures on 35 , whenever possible. Needless to say, we weren't very keen to do this as standard procedure, day in day out; & to my recollection we only ever did this if the wx. conditions were such as to preclude a landing on 35.