You already mentioned somewhere they have already figured it out? If so, good luck to them, for once they utilized God's mandated command. My concerns were/are in general and I brought a moon sighting example to highlight these. You live in UK, did they figure out moon sighting issue in UK? For most Muslims, clear and unambiguous Quranic commands are subjected to outside influence and interpretations, sometimes running contrary to what is/was the intent and purpose of such verses.