Yep all airports have to follow World Meteorological Organisation and International Civil Aviation Organisation regulations and I'm sure all do, blimey i hope so lol This study was originally started for early study of wind shear in the UK as PART (obviously along with other data) of a independent storm reporting network and was experimental between 5 independent (not BAA) airports (more have joined since), the study has continued over years and I'm sure has reached its conclusion on the small effects of wind shear in the UK, however the stats are still being recorded and the information is collated and used purely by the International Federation of Air Line Pilots' Associations members and its not reported or collated for use in any other way. We report various real time data to the International Federation of Air Line Pilots' Associations for use in various educationals and to universities for various projects. I suppose you could call this an independent experiment, i just don't know when it ends lol When i worked for BAA airports we use to report data for independent sources, so its rather like that!