The Telegraph spread the revelations out over several weeks
The Daily Telegraph has picked up a string of honours including newspaper of the year at the British Press Awards after its stories on MPs' expenses.
The revelations last spring led to resignations and a Commons inquiry.
Group editor Will Lewis was journalist of the year, Robert Winnett was top political journalist and the paper won best scoop and best special supplement.
Expenses row campaigner Heather Brooke won a special award. Reporter of the year went to the Guardian's Paul Lewis.
The Daily and Sunday Telegraph began to publish stories on MPs' expenses after buying details from a Westminster source before they were officially released.
Over a series of weeks, the Telegraph detailed what MPs had claimed, highlighting the spending on items as wide-ranging as moat-cleaning, duck islands and bath plugs, while also shining a light on practices, such as the "flipping" between homes, that voters had previously been unaware of.
Telegraph Group papers saw a sales boost and traffic to its website increased.
Reporter of the year Paul Lewis has gathered a number of awards for his stories on the G20 protests in London last year, specifically his investigation into the events surrounding the death of Ian Tomlinson.
The British Press Awards were hosted by BBC Radio 4 presenter John Humphrys and took place at the Grosvenor House Hotel.
Other winners included former England cricket captain Mike Atherton, who took sports journalist of the year for his work in the Times, and the Daily Mail's political sketch writer Quentin Letts, who was named critic of the year for his theatre reviews, which are carried in the same newspaper.
Here is a full list of the winners of the British Press Awards:
Newspaper of the Year: The Daily Telegraph
Scoop of the Year: Daily Telegraph: MPs' expenses
Journalist of the Year: Will Lewis, editor-in-chief, Telegraph Media Group
Business and Finance Journalist of the Year: Iain Dey, The Sunday Times
Sports Journalist of the Year: Mike Atherton, The Times
Photographer of the Year: Stefan Rousseau, Press Association Images
Sports Photographer of the Year: Andy Hooper, Daily Mail
Showbiz Reporter of the Year: Dan Wootton, News of the World
Interviewer of the Year: Camilla Long, The Sunday Times
Digital Innovation: SunTalk, The Sun
Critic of the Year: Quentin Letts, Daily Mail
Columnist of the Year: Caitlin Moran, The Times
Cartoonist of the Year: Peter Brookes, The Times
Young Journalist of the Year: Sheera Frankel, The Times
Cudlipp Award for Campaigning Popular Journalism: Andrew Penman and Nick Sommerlad Investigate, the Daily Mirror
Regular Supplement of the Year: You Magazine, Mail on Sunday
Special Supplement of the Year: MPs' Expenses, The Daily Telegraph
Feature Writer of the Year: Tanya Gold, The Guardian
Campaign of the Year: MPs' expenses, Daily Telegraph
Specialist Journalist of the Year: Jason Lewis, Mail on Sunday
Political Journalist of the Year: Robert Winnett, The Daily Telegraph
Foreign Reporter of the Year: Marie Colvin, The Sunday Times
Reporter of the Year: Paul Lewis, The Guardian
Journalists' Charity Award: Walter Greenwood
Foreign Journalist of the Year: J.S. Tissainayagam, from Sri Lanka
Special award: Heather Brooke