Caereinion High School - in Llanfair Caereinion from Google Streetview. A PROPOSAL to merge a primary and secondary school in Llanfair Caerenion is back on track. At a meeting on Tuesday, February 16, Powys County Council’s Independent/Conservative cabinet brushed aside concerns that the decision to go ahead with the process of creating an all-through school for four to 18 year olds in January, had been ‘flawed’. It came after a learning and skills scrutiny committee discussed the merger earlier this month, demanding that it go back to the cabinet to be reconsidered. Part of the issue is that Llanfair Caereinion could become the Welsh Medium secondary school for the whole of Montgomeryshire, ahead of other potential sites in Welshpool or Newtown.