Wedi hynny, cawsom wybod bod Aelod-wladwriaeth yr UE wedi cyflwyno barn fanwl, a oedd yn ymestyn y cyfnod segur dri mis arall hyd 21 Awst 2019. Cyflwynwyd ymateb manwl a oedd yn amlinellu cyfiawnhad Llywodraeth Cymru dros gyflwyno polisi isafbris uned yng Nghymru a pham fod Llywodraeth Cymru yn parhau i fod wedi ymrwymo i gyflwyno'r ddeddfwriaeth hon.
We subsequently received notification that an EU Member State had submitted a detailed opinion, which extended the standstill period by an additional three months to 21 August 2019. A detailed response was submitted setting out the Welsh Government’s justification for introducing a MUP policy in Wales and why the Welsh Government remains committed in introducing this legislation.