Travellers in all classes were served three types of Champagne to sample and a slice of Opera cake. An official Guinness World Records adjudicator announced that the record had been broken, with a total of 515 travellers taking part.
The tasting also marked two years since Blanc partnered with Eurostar to oversee the on-board dining experience on its trains.
Blanc said: "I’m honoured to have been on board this special service to celebrate Eurostar’s 20th Anniversary and set a new Guinness World Records title for the largest Champagne tasting event. The Champagnes were carefully selected and I hope everyone will join me in raising their glass to mark this momentous occasion."
Marc Noaro, service and people director at Eurostar, added: "Today marked the start of our 20th anniversary celebrations and we’re delighted to have shared this special occasion with our passengers who joined in the festivities and set a new Guinness World Records title.
"With a leap in passenger numbers, as well as the introduction of new routes and new destinations, there are plenty of reasons to celebrate this year. From our birthday on 14 November, we’ll be hosting a series of events for customers to commemorate our birthday and thank them for their support over the past two decades."
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