For years it has been the most patriotic night in the classical music calendar, seeing the Royal Albert Hall decked out with Union Flags and concert-goers singing along to Rule, Brittania! and Land Of Hope And Glory.

But this weekend’s Last Night of the Proms could have a rather different atmosphere, as an anti-Brexit group plans to hijack the event with European Union flags.

A crowd-funding campaign is under way to buy 5,000 blue EU flags, with a group of volunteers poised to give them out to members of the public ahead of the sold-out event to wave during the night, the Telegraph can disclose.

Organisers hope to transform the evening from a joyful singalong to one which shows “solidarity with the EU”, taking advantage of its “very high profile” and television audiences to “send a message to the world”.