Supply estimates are the means by which the Government seeks authority from Parliament for its own spending each year. These main estimates start this process and are presented to Parliament around the start of the financial year to which they relate. Detailed departmental estimates are included, and a Supplementary budgetary information publication ( Cm. 7880 , ISBN 9780101788021) presented alongside provides read-across between the figures in the main estimates and departmental reports. The total resource expenditure for which authority is sought in the 2010-11 main estimates is GBP 495.1 billion.