Mae gwerth £78.9m arall yn cael ei ostwng yn dilyn y gostyngiad o £43.1m yng nghyfrifon 19/20. Cafodd y cyfanswm gwariant hwn o £135.7m ers dechrau'r prosiect, a hyd at y pwynt lle y penderfynwyd peidio â bwrw ymlaen, ei wario ar waith datblygu gan gynnwys arolygon amgylcheddol, data ymchwilio tir a modelau trafnidiaeth. Bydd y penderfyniad yn cael ei gynnwys yng nghyfrifon Llywodraeth Cymru ar gyfer 2020/21 a chyhoeddir y Datganiad Ysgrifenedig hwn cyn cyfrifon terfynol 2020/21.
The writing down of a further of £78.9m follows on from the £43.1m reduction in the 19/20 accounts. This is part of the total expenditure of £135.7m since the inception of the project and up to the point at which the decision was taken not to proceed was incurred on development work including environmental surveys, ground investigation data and transport models. The decision will be included in the Welsh Government accounts for 2020/21 and this Written Statement is published advance of the final 2020/21 accounts.