The Revenue spent £5.5m on TV ads in which viewers were nagged to return their self-assessment forms in time by Pauline McLynn, in her character of Father Ted's manic housekeeper Mrs Doyle in the TV comedy series. The forms, introduced in 1996, are so complex that eight out of 10 MPs are unable to fill them in unaided, according to the Chartered Institute of Taxation. Almost any return is open to interpretation, and the Revenue holds the upper hand with small businesses that cannot match its legal and accountancy resources.