The Combined Online Information System COINS is a database of UK Government expenditure provided by government departments. The data is used to produce reports for Parliament and the public including: expenditure data in the Budget and Pre-Budget reports; Supply Estimates; Public Expenditure Statistical Analyses PESA; the monthly Public Sector Finance Releases. It is also used by the ONS for statistical purposes.

This is the raw data, so you can do with it what you like.

via Combined Online Information System | data.gov.uk.