In reply to Rampart:
> Can one put a bike on the Eurostar in a ready-to-ride state? I think I read that they want them boxed, which seems like a massive hassle.
It just requires removing the wheels and handlebars. Plus you get the benefit of stashing other bulky stuff (helmet, track pump, body armour etc.) in the bag/box.
It's a minor inconvenience compared to the hassle of boxing/bagging for aeroplane travel, which requires packing everything with multiple layers of bubble wrap, removing pedals and derailleurs, and (as I learned the hard way) even having to remove discs from the wheels. And if you have a carbon frame, even with all the protection you're still always a bit worried.
But I agree it's more hassle than slinging the bike in the back of a van and driving down!