In addition, to add those further tissues to the list in Wales would potentially mean that England would need to revisit the Regulations which were made earlier in 2020.
Hefyd, byddai ychwanegu’r meinweoedd hynny at y rhestr yng Nghymru’n gallu golygu y byddai angen i Loegr ailedrych ar y Rheoliadau a wnaed yn gynharach yn 2020.