If there is support for the additional INSET day, the first additional INSET day would be in the Summer term of the 2022 to 2023 academic year.
Os oes cefnogaeth ar gyfer y diwrnod HMS ychwanegol, byddai'r diwrnod HMS ychwanegol cyntaf yn nhymor yr haf ym mlwyddyn academaidd 2022 i 2023.