The Committee on Standards said Averbrook Ltd. - the firm which Nadine Dorries' I'm A Celebrity fee was paid to - had "no income from any sources other than her media appearances".
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A Christian lobby group that backs the disgraced Australian rugby union star has raised more than £414,000.
A retrial is expected to take place on October 7.
MPs have released documents relating to the now defunct TV show ahead of a grilling of ITV bosses.