#OperationCroissant turned into "Operation Postcard" with almost 500 cards carrying messages of friendship and solidarity handed out to commuters scurrying between Kings Cross and St Pancras, the Eurostar terminal.
"The idea was conceived by a group of friends on both sides of the Channel who wanted to show a gesture of love and good will between London and Paris," writer, Rosa Rankin-Gee told Sputnik.
"People wanted a chance to say something sweet and positive during a debate that has been characterized by negativity."
Rankin-Gee says she is English and has lived in France for the past five years and admits she has personally benefited from Europe's open borders and freedom of movement.
"We've tried to keep this campaign as a-political as possible — but I agree with the sentiments that we are stronger together. No man is an island."
Imogen Roy, who joined Rankin-Gee in London for Operation Croissant, told Sputnik they'd received hundreds of messages.
"The response from French people was so positive. So many people wanted to write a message, or help volunteer. We received hundreds of messages from Parisians and from people living in Northern France.
"They speak of feeling really connected with the UK. One wrote, 'In culture, in food and in lifestyle, in France we feel more connected with the UK than we do with Paris.' "
Other messages simply said: "We love you please don't go."
"Some of the messages were really moving and we started receiving message of support from Holland, the US and Australia showing their solidarity to the European Union," Roy told Sputnik.
"I'm an immigrant to France. I was born in London, grew up in Germany, schooled in Scotland and live in France. I feel European first, British second."
The croissants had been baked in a 12th century Parisian bakery in a wood fire oven — but after a conversation with the Metropolitan Police and the Electoral Commission, they agreed not to hand them out.
"So we've donated them all to the St Mungo's homeless shelter in Kings Cross instead, who have said they are very pleased to receive them."
"What if I bring you a croissant from Paris, maybe it will change your mind?" Rankin Gee responded, "And she put a cross in the Remain box in her postal vote.
"It's the simplest thing — maybe you can change someone's mind with the simple act of breaking bread," Rankin-Gee told Sputnik.
Polling stations open across the UK at 07:00 BST, Thursday 23 June 2016.