This additional INSET day was available during the 2019 to 2020, 2020 to 2021 and 2021 to 2022 academic years.
Roedd y diwrnod HMS ychwanegol hwn ar gael yn ystod blynyddoedd academaidd 2019 i 2020, 2020 i 2021 a 2021 i 2022.