There is an intermodal terminal at Barking, accessible from the UIC gauge High Speed One, and there are projects to use it at last with cross-Chunnel trains too. I reported in Rail News Bloggings that both the Modalohr system (which only carries the semi-trailers but is actually faster to load and more weight-efficient than RoLa) and a more traditional semi-trailer piggyback car (currently in use along the Rhine corridor) got permission to run through, and there are specific plans with dates for regular service at least for the second.

_{*Lunatic*, n.
One whose delusions are out of fashion.}