Mae swyddogion Llywodraeth Prydain yn yr Adran Drafnidiaeth, wedi cyflwyno dull newydd o gynnal eu rhagolygon twf newydd, newid annisgwyl nad oeddent wedi ei rannu ymlaen llaw â Llywodraeth Cymru, sydd wedi golygu bod oedi cyn dechrau’r ymchwiliad.
UK Government officials at the Department for Transport, have introduced revised methodology to their new forecasting for growth, an unexpected change not shared in advance with the Welsh Government, which has necessitated a delay to the inquiry start date.