Loading gauges have been heightened on several US railways to accommodate double-stack container trains, so it's certainly not impossible. However I don't think the neoliberal economics line up for Britain anytime soon, and even under socialist economics it has questionable value.
The loading gauge is too small. British trains have a very small loading gauge (the space a train can fit in) so tunnels and bridges wouldn't allow it. They did try to fit the trains in the loading gauge anyway, leading to a strange train in the 40s that had many issues and never went beyond two train prototypes
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Loading gauges have been heightened on several US railways to accommodate double-stack container trains, so it's certainly not impossible. However I don't think the neoliberal economics line up for Britain anytime soon, and even under socialist economics it has questionable value.
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