Actor Patrick Stewart drew on his two best-known characters as he helped launch a campaign to give voters the final say on any deal Britain negotiates to leave the European Union.
Respondents were asked to what extent they supported or opposed the public voting on the final Brexit deal the British government makes with the EU.
Meanwhile, a separate survey by finance company Bibby Financial Services found that confidence at small and medium companies rose to its highest level since the second quarter of 2015 when the bill for an European Union referendum was first unveiled in the Queen's Speech.
The push is run by Open Britain, which grew out of the official Remain campaign of the 2016 referendum.
James McGrory, executive director of the Open Britain campaign group, said: "Our largest ever national day of action is all about bringing together the various pro-European groups so that we can speak with one unified voice, because we know that together we are stronger". "It should not be a done deal".
Liberal Democrat MP Layla Moran, a leading supporter of the People's Vote campaign, said:"It may seem like the odds are stacked against us as a movement, but fighting for what you believe in is never easy".
"Brexit will affect everybody in the country, which is why it should not be left to 650 politicians to decide our future but 65 million people".More news: King departs for Saudi Arabia to take part in Arab Summit
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Speaking at the rally, Green Party co-leader Caroline Lucas said: "We'll do everything we can in Parliament for a people's vote".
Fraser Nelson, from the Spectator, told Andrew Marr during the press review this morning that the People's Vote was a desperate attempt by wealthy, London-based celebrities. "Together, are on the verge of something extraordinary".
Actor Sir Patrick Stewart, who backs the campaign, said if people voted to reject the exit deal, the United Kingdom would "simply stay" in the EU.
The first step would be to convince enough lawmakers - crucially Labour and Conservative backbenchers, emboldened by demand from the public - to get a new referendum in legislation, likely through an amendment to a Brexit bill.
Stewart added: "As time has gone by, the information that we are receiving about the terms and conditions of that separation are quite unlike the terms and conditions that were spoken of so loosely during the 2016 campaign".
May has repeatedly said she will deliver what she calls the will of the people and on Sunday Foreign Minister Boris Johnson voiced optimism for the kind of deal Britain could win.