I just want to say as an ATCO..respect to those pilots who have flown today...basically through the unknown....no matter what all the 'experts' say...nobody knows what could happen and still you went to work! Have to say even on the ground it felt a bit strange.... esp giving pilots VFR clearance and then IFR passing fl200...later Fl250 (in Germany)....so respect and well done!! Not sure I would have been so brave!!