Mae Ysgrifennydd Cyllid Llywodraeth Cymru, Mark Drakeford, ac Ysgrifennydd Cyllid Llywodraeth yr Alban, Derek Mackay, wedi ysgrifennu at y Trysorlys yn galw am weithredu proses ffurfiol i ddatrys yr anghydfod drwy'r Cyd-bwyllgor Gweinidogion.
The Welsh Government’s Finance Secretary Mark Drakeford and the Scottish Government’s Finance Secretary Derek Mackay have written to the Treasury to invoke the formal dispute resolution process through the Joint Ministerial Committee.