Bev Jenkins, from Estyn, says children are making progress in Welsh language development in the majority of English-medium schools, but more needs to be done to improve Welsh reading and writing skills.
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Welsh students who work in Wales after graduating could benefit from tuition debt write-off of up to £6,000 a year, under new Plaid plans.
There are already 17 directly elected Mayors in England but none across the border so far.
Bristol Airport says abolishing air passenger duty in Wales would result in passengers and airlines flying from Cardiff instead.