In 2000 Iain McLean, a professor of politics, and Martin Johnes, a research fellow in Welsh history, undertook a study of the Aberfan disaster and its repercussions; their work included government papers released in 1997 under the thirty-year rule. Their opinion is that "the Coal Board 'spin-doctored' its way out of trouble, controlling the public agenda from the day of the disaster until the tips were finally removed". Robens had received a copy of the inquiry report ten days before its official publication and began a campaign to strengthen his position. He went on a tour of British coalfields, giving speeches that promoted the use of coal and criticised the increasing popularity of nuclear power. All messages of support to him were catalogued by the NCB, and copies of some were leaked to the press; the manoeuvring led to criticism in an editorial in "The Guardian", which stated that "the Coal Board's behaviour has ... been rather unseemly in the circumstances".