As part of the DCLG Local Government Transparency Code 2015, Local Authroities should publish the following car parking related datsets annually.
a breakdown of income and expenditure on the authority’s parking account. The breakdown of income must include details of revenue collected from on-street parking, off-street parking and Penalty Charge Notices, and a breakdown of how the authority has spent a surplus on its parking account.
Local authorities must also publish the number of marked out controlled on and off-street parking spaces within their area, or an estimate of the number of spaces where controlled parking space is not marked out in individual parking bays or spaces.