At the time Leanne Wood's oath swearing seemed to be a passing footnote in history. It was dismissed as the usual suspects showing their leftist credentials
Of course, there could be another more sinister explanation. It may not be Labour at all. The culprit could be someone from Plaid Cymru itself. There have been mutterings of disenchantment with her leadership. As Harold Macmillan once said your opponents are opposite, your enemies sit on the benches behind you. It might yet again be proved to be a very apt in this context.