where does the eurostar go from in london
Amsterdam, Brussels, Bourg-Saint-Maurice, Disneyland Paris, Lille, Calais, Marseille, Paris, and Rotterdam.
Eurostar
Eurostar is an international high-speed railway service connecting London with Amsterdam, Brussels, Bourg-Saint-Maurice, Disneyland Paris, Lille, Calais, Marseille, Paris, and Rotterdam. 
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Eurostar [SEP] Introduction
Eurostar is an international high-speed railway service connecting London with Amsterdam, Brussels, Bourg-Saint-Maurice, Disneyland Paris, Lille, Calais, Marseille, Paris, and Rotterdam. All its trains travel through the Channel Tunnel between the United Kingdom and France, owned and operated separately by Getlink. The London terminus is St Pancras International, the other British calling points are Ebbsfleet International and Ashford International in Kent but these will not reopen until at least 2022. Intermediate calling points in France are Calais-Fréthun and Lille-Europe, with trains to Paris terminating at Gare du Nord. Trains to Belgium terminate at Midi/Zuid station in Brussels. The only intermediate calling station in the Netherlands is Rotterdam Centraal and trains terminate at Amsterdam Centraal.