 The Preserved County of Clwyd came into effect on the same day that Clwyd County Council was abolished . The preserved county was almost identical to the 1974 – 96 county , but had a few minor changes in line with changes to local government boundaries , the communities of Llanrhaeadr @-@ ym @-@ Mochnant , Llansilin and Llangedwyn being transferred from Clwyd to Powys . 
