Two small-scale follow up research reports (recontacting 2020 respondents) have been published to date on Rules of Origin and Mode 5 Services.
Mae dau adroddiad ymchwil dilynol ar raddfa fach (sy’n ailgysylltu ag ymatebwyr 2020) wedi’u cyhoeddi hyd yma ar Reolau Tarddiad a Gwasanaethau Modd 5.