Rob Evans, a Guardian journalist, submitted a freedom of information request to see the letters but this was denied by the information commissioner.
Parts of that letter sent by the energy secretary, Amber Rudd, in June were briefed to the media, but a freedom of information request to get the whole letter released, as well as the responses from the energy firms, has so far failed amid claims from the department that the letter may have policy implications.
Following a freedom of information request, Plaid Cymru obtained a letter to the Chief Treasury Secretary Danny Alexander written by Welsh Finance Minister Jane Hutt last June.
And on June 4, the IRS apparently completed a total of 180 donor information requests, drafting a letter to the tea party groups "that provided donor information".
The Web site posting came a day after the Office for Human Research Protections, responding to a Freedom of Information request filed by The New York Times, released letters it had received from Johns Hopkins officials.
Guardian journalist Rob Evans made a Freedom of Information request to see the Prince's letters in 2005.
The letters were obtained by Friends of the Earth (FoE) under a freedom of information request.
Letters between the Liverpool-based hospital and the CQC were released after a Freedom of Information request from the BBC.
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"The Chairman looks forward to reviewing the full response, including all of the information requested in the April 25 letter," a committee aide says.
Because these businesses usually have an address to go along with a name, they can simply send a letter with the information requested, or send a log-in and password so the consumer can view the information online.
