Mae Llywodraeth y DU yn apelio yn erbyn dyfarniad yr Uchel Lys nad oes gan Weinidogion y DU y pŵer i roi rhybudd Erthygl 50 i’r DU adael yr Undeb Ewropeaidd gan ddefnyddio Uchelfraint y Goron.
The UK Government is appealing against a High Court judgment that UK Ministers do not have the power to give notice under Article 50 for the UK to withdraw from the European Union using the Crown Prerogative.