The Mayor of London, Boris Johnson, has endorsed an initiative by the Prime Minister and the Secretary of State for Communities and Local Government to promote transparency in the public sector by publishing all expenditure over £500.
These reports are available in both comma delimited format (CSV) and portable document format (PDF), and are listed on the Transport for London website.
This excludes items in accordance with exemptions available under the Freedom of Information Act 2000 and the Environmental Information Regulations 2004.
See more on the TFL website.