In order to support this, a basic and enterprise agreement between the business improvement zone and the local authority is established within the framework of the establishment of an IDB, valid for the duration of the period. For more information on business improvement districts and regulations, see: www.gov.uk/guidance/business-improvement-districts All Business Improvement District`s in the UK as part of governance and regulations established by the government. These rules give strict rules on how an IDB can work and how it can invest.