First buy your Eurostar ticket, then call Eurostar's baggage line on ** 0870 5 850 850 ** to book a bike space on the same train"
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Just a heads up (to whoever is travelling), be careful with this. A few weeks ago I arrived in Brussels for them to tell me that my bike was not there and was going to arrive 3 hours later, despite the fact I had booked in advance, had handed it over on time and there didn't seem to be any other bikes on my train or the one it eventually came on. I'm sure it doesn't happen a lot, but I'd just make sure that you make a big deal about it arriving at the same time as you when you give it to the handlers in London if you do end up paying the 20 squids.
Just a heads up (to whoever is travelling), be careful with this. A few weeks ago I arrived in Brussels for them to tell me that my bike was not there and was going to arrive 3 hours later, despite the fact I had booked in advance, had handed it over on time and there didn't seem to be any other bikes on my train or the one it eventually came on. I'm sure it doesn't happen a lot, but I'd just make sure that you make a big deal about it arriving at the same time as you when you give it to the handlers in London if you do end up paying the 20 squids.