Bias 

This article has clearly been written by an editor or editors hostile to Plaid Cymru. It is what journalists would call an "attack piece". It's not that the facts given are incorrect, more that what is included in the article seems to have been carefully selected to show Plaid Cymru in the worst possible light. It stands out among the articles on UK political parties - the others all manage to remain at least approximately neutral, whatever the other deficiencies of some of them.