Day train to Copenhagen

I am spending a whole day on trains today, as I seek to find a lower carbon route from London to Copenhagen. I visit that wonderful city regularly for work and am likely to need to do so more in the future. In a previous job I used to take the night train, but time pressures pushed me into flying – a bad habit that I am now trying to break. Well aware of the hypocrisy of a climate change professional spending so much time inside a kerosene-fuelled metal bird, I am very much hoping that the day-time rail route proves viable.