Some of the cornerstones of the British constitution can be accessed here.
For scholars the records are important primary documents for their research. Once they were available to a priviliged few - but now increasing numbers of these records are available to many more people. Some have been digitised - To access these press here. The Archives at Westminster is usually open to the public all year round, Monday to Friday, 9.30am to 5.00pm (apart from public holidays).
To find out more about the Parliamentary Archives go to http://www.parliament.uk/publications/archives.cfm