Clive DaWhatDoTheyKnow is a UK organisation that obtains and publishes datasets under the freedom of information act
It is a site to help anyone submit a Freedom of Information request. WhatDoTheyKnow also publishes and archives requests and responses, building a massive archive of information.
an example of such a dataset is a list of railway tunnels in the UK
If you are interested in FOI and have some spare time you can volunteer to help
