The law Regulation 34 of the Public Contracts Regulations (SI 2015/102) (PCR 2015) (PCR 2015, SI 2015/102, reg 34) allows a contracting authority to procure a public contract through a dynamic purchasing system (DPS). PCR 2015, SI 2015/102, reg 34(1) provides that a DPS can be used by a contacting authority to procure commonly used goods and services which are generally available on the market and which the authority requires to meet its needs. An example might be an annual supply of stationery requisites. Procurement through a DPS is operated completely electronically (PCR 2015, SI 2015/102, reg 34(2)). This means that a DPS is a flexible procurement system. For example, under a DPS new provides can be admitted to the system during its operation. This contrasts with procurement under a framework agreement, where provides are fixed at the time the agreement is established. A