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Located here. http://www.geograph.org.uk/photo/5172831 The sign has an example of Welsh mutation. The preposition i (to) causes the D of Dinas to mutate to DD in Welsh. As anyone who has seen a Welsh language Scrabble set knows, DD is one of several digraphs with their own tile because each digraph is one letter, not two, in Welsh orthography. For example, a word such as ffordd has to be played using only 4 tiles, including the FF tile and the DD tile. It is not allowed to use 2 F tiles or 2 D tiles for such a word.