Er gwaethaf galwadau gan Lywodraeth Cymru, ni chyhoeddwyd unrhyw adnoddau ychwanegol i helpu Cymru i baratoi ar gyfer effaith y posibilrwydd o Brexit heb gytundeb. Cyflwynwyd y Cylch Gwario ‘carlam’ un flwyddyn yn dilyn penderfyniad i ohirio'r Adolygiad Cynhwysfawr o Wariant dros dair blynedd a addawyd ers tro. Mae Llywodraeth Cymru wedi datgan nad oes ganddi hyder yn y ffigurau y seiliwyd y Cylch Gwario arnynt, sy'n dod o ragolygon economaidd a gynhyrchwyd fis Mawrth a rheolau cyllidol gweinyddiaeth flaenorol.
Despite calls from the Welsh Government, no additional resources have been announced to help Wales prepare for the impact of a potential No Deal Brexit. The ‘fast tracked’ one year Spending Round was introduced following a decision to cancel a long promised 3 year Comprehensive Spending Review. The Welsh Government has stated it does not have faith in the figures underpinning the Spending Round which are based on economic forecasts produced in March and the fiscal rules of a previous administration.