SLF
One further point - some of Ryanair's older B737-200 aircraft are ex Lufthansa and are fitted with large hush-kits at the rear of each engine. When BA looked at this mod some years ago a drawback was that it downgraded the autoland capability from CAT 111A (50'/200m) to CAT11 (or even CAT1). This was because only 25 degrees land flap could be used. What sort of 737 did you start on? An old one I guess, hence the change at STN...