Parliamentary standards commissioner Sir Philip Mawer has said he will investigate allegations about Iain Duncan Smith's employment of his wife Betsy in his private office. Here is the full statement which he has issued. "I have studied carefully both the complaint I have received from Mr Michael Crick and Iain Duncan Smith's response to that complaint.
"The nature of the information given to me - some of which is from anonymous sources - makes it necessary that I should undertake further inquiries before reaching a conclusion on the complaint.
"It's in the public interest that these inquiries should be conducted thoroughly, fairly and as expeditiously as possible.
"With that in mind, I have asked Mr Crick and anyone else who believes they have relevant information to let me have all of it immediately and in any event before the end of this week.
"In view of the public interest in Mr Crick's complaint, I expect to report the result of my inquiry to the Committee on Standards and Privileges.
"The fact that I'm making further inquiries and expect to report to the committee does not imply that I regard the allegations against Mr Duncan Smith as substantiated - simply that I need additional information in order to be able to evaluate them properly."