1st September 2021 to 31 August 2022 January, April, September 2026 31 January 2025 16 April 2025 or the next working day 14 May 2025
1 Medi 2021 to 31 Awst 2022 Ionawr, Ebrill, Medi 2026 31 Ionawr 2025 16 Ebrill 2025 - neu’r diwrnod Gwaith nesaf 14 Mai 2025