The regs say that the bike has to be bagged. If you are using Eurostar a lot, you might want to get the Carradice bike bag, which folds quite small, and is regulation TGV/Eurostar size.
http://www.carradice.co.uk/shoulderbags/pro-bike-case-inc-wheel-cover.shtml
@Buffalo_Bill started
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The regs say that the bike has to be bagged. If you are using Eurostar a lot, you might want to get the Carradice bike bag, which folds quite small, and is regulation TGV/Eurostar size.
http://www.carradice.co.uk/shoulderbags/pro-bike-case-inc-wheel-cover.shtml