5.18 It is likely that under contractual terms the PPP contractor may be able to exclude a company from bidding where, in its reasonable opinion, it believes that such a company would increase the risk to the project in an unacceptable manner. The public sector client should be able to request the exclusion of any prospective bidder on the grounds of capacity, capability, financial standing and security or for reasons that, in the opinion of the public sector client, are in the national interest. Organisations that are not shortlisted should be given the opportunity of a debrief.