Hopkirk also mentions Felixstowe, which is the UK's largest container port (and the second largest in Europe, after Europoort Rotterdam). A lot of work has been carried out to increase the number of containers going into and out of Felixstowe by rail (such as increasing the tunnel clearance at Ipswich, to enable bigger containers to go through it, and laying new track in Ipswich, so that trains from the west no longer have to go into Ipswich Goods Yard and then reverse out). However more investment in the rail infrastructure is still needed, such as dualling the track between Ipswich and Felixstowe (which is currently only a single track line for much of its length).
In the meantime, vast numbers of container lorries continue to thunder along the A14 (which is one of the UK's busiest A-roads), just up the road from me, in order to access Felixstowe Docks.