I was in Germany, called and was quoted 278 Euros to travel from Germany to London. When I got to the train station, I was told that Eurostar booking systems was "down", and I could buy a ticket to Paris (for 100Euros) then book Eurostar to London. No problem getting to Paris...then I was stuck... no one available to help who could speak English, and when I finally did find someone, she told me the fare was now ANOTHER 248 Euros. I asked if I could get on the next train. NO, was the answer, as the ticketing system was down, and no one could help me. I would HAVE to spend the night in Paris (in a dump of a hotel!) and try for the next morning.
Another 55 Euros to stay in this horrible hotel.
Then I couldn't get my ticket at the train station, the ticket machine did not work!
It ended up costing me over 400 Euros for a ticket I was quoted at 278! And I was so stressed out. Eurostar refuses to refund the difference between what I was quoted and what I actually paid. They tried to tell me that I went to the wrong ticket counter in the train station in Paris and that it was all my fault. No refund!
Db Bahn is starting service through the Chunnel in 2013-- can't wait... I will travel on their service before I would EVER consider Eurostar. Eurostar is more interested in making money than having customers satisfied.
They even told me that everything that could possibly go wrong... did. But take no responsibility for it.