House of Commons parliamentary papers
It isn't ezproxied, but to get a feel for the range of materials covered in this collection check out "mode of admission to the British Museum and its Reading Room"
sigh....the good old days.
Between 1801 and 2000, around 9.5 million pages for over 184,000 parliamentary papers were published. Since 2001, the number of papers has grown by approximately 4,000 for each parliamentary session. HCPP delivers searchable full text for each paper, along with a detailed index.
HCPP currently contains an index for 1801-2004, full text for the entire 19th century, and for 1901-1906.
The remaining 20th century content will be added in a series of substantial releases over the next year, beginning in May with the addition of 1914-1945. (Your institution's coverage varies according to your subscription.)