They paid for the adverts using their Communication Allowance, and whilst they did seek guidance on the content, the Select Committee on Standards and Privileges concluded that "the advice given to them, in good faith, was based on incomplete information". The report went on to say that,
"Taken overall, the fact that the advertisements appeared virtually simultaneously; the proximity of publication to the Welsh Assembly elections; the prominent use of party logos; and the extensive nature of the reports' distribution beyond the Members' own constituencies, in our view constitutes campaigning, and therefore breaches paragraph 6.1.1. of the Green Book.As a result the Committee has said that all three MPs must pay back the cost of the advert. I wonder if Ruth Kelly will face the same punishment for her misuse of public funds for party political purposes?
Copies of the Plaid avderts can be seen here.