Where you have determined that minimum standards are applicable (either within selection or award criteria) they must relate to and be proportionate to the subject matter of the requirement.  This must be clearly detailed in the appropriate documentation.

When you wish to apply minimum standards to limit the number of potential suppliers to be invited to tender, minimum standards or objective criteria must be specified or referred to in the Contract Notice. This must be detailed in the procurement documentation to allow the rejection of potential suppliers.

Similarly if a pass mark can only be obtained by a response that meets the minimum requirement, this must be clearly stated within the scoring guidance provided to suppliers.