It would mean that schools would continue to hold six INSET days per year for the next 3 academic years, with the school being closed to learners on the additional INSET day.
Byddai'n golygu bod ysgolion yn parhau i gynnal chwe diwrnod HMS y flwyddyn am y 3 blynedd academaidd nesaf, gyda'r ysgol ar gau i ddysgwyr ar y diwrnod HMS ychwanegol.