"Mae'r rhan fwyaf o'r risgiau yn ymwneud â threfniadau'r ffin - tollau a gwiriadau diogelwch. Cyfrifoldeb Llywodraeth y Deyrnas Unedig yw datrys y risgiau hynny. Ond gallai gofyniad yr Undeb Ewropeaidd ar i'r aelod-wladwriaethau, gan gynnwys Iwerddon, drin nwyddau o'r Deyrnas Unedig fel trydedd wlad - gyda'r holl wiriadau ychwanegol y byddai hynny'n eu golygu - achosi oedi difrifol ym mhorthladdoedd fferïau Cymru, yn arbennig Caergybi.
“Most of the risks relate to border arrangements – to customs and safety checks. These are for the UK government to resolve. But the requirement by the EU for member states, including Ireland, to treat goods from the UK as a third country – with all the additional checks that involves – could cause knock-on delays at Welsh ferry ports, especially Holyhead.