Ers yr Adolygiad o Wariant, mae Llywodraeth y DU wedi cytuno mewn egwyddor i ariannu cost adeiladu’r cyfleusterau parhaol a’r cyfleusterau dros dro o dderbyn hawliad sy’n seiliedig ar achosion busnes ar gyfer Gogledd a De-orllewin Cymru. Dim ond y costau hynny sy'n gwbl angenrheidiol hyd at a chan gynnwys 2024-25 fydd yn cael eu hystyried. Er bod Llywodraeth y DU wedi cytuno'n amodol i ariannu costau adeiladu'r BCPs, mae wedi dweud yn benodol na fydd yn talu costau eu gweithredu.
Since the Spending Review, the UK Government has agreed in principle to fund build costs for both permanent and interim facilities upon submission of a reserve claim, supported by business cases for North and South West Wales. Only those costs which are absolutely necessary up to and including 2024-25 will be considered. While the UK Government has conditionally agreed to fund the construction costs of the BCPs, it has explicitly said it will not meet the operational costs.