As explained, new infrastructure at ports will be needed whether or not the UK secures a negotiated agreement with the EU as the UK is leaving the Customs Union and Single Market and new procedures will be coming into place.
Specifically, the Port Infrastructure Fund is targeted at those ports that have the space to build new border infrastructure on their current sites so that they are ready to handle new customs requirements under the new Border Operating Model. The funding can be used for a range of vital port infrastructure – from warehouses and control posts to traffic management systems.