Constrained overall UK public spending and unnecessary restrictions on the Welsh Government’s budget also adversely impacted on devolved responsibilities during this period.
Ar hyn o bryd, bob tro y ceir cylch cyllideb yn y DU, mae risg y gallai newid gael ei wneud sy'n effeithio ar drethi datganoledig ac sy’n cael effaith gyllidebol uniongyrchol ar adnoddau Cymru.