It does seem "convenient" that these allegations have surfaced at this particular time. If there was porn, there could have been other people in the office using that computer, and it is very difficult for him to challenge this after 9 years have elapsed.
This old story shows that the chances are his computer was not alone in having porn on it, so curious he is being singled out:
www.independent.co.uk/news/parliaments-p...mputers-8797386.html