Russell Brand has felt the wrath of an angry bank worker who has written a letter of complaint to the star for staging a "futile publicity stunt" at his place of work, forcing him to miss his lunch and stand in the cold.

The actor/funnyman has been a regular in the headlines in recent weeks, joining a number of marches and demonstrations in both the U.K. and U.S. during the promotional campaign for his anti-democracy book Revolution.

He also staged a stunt at the London headquarters of The Royal Bank of Scotland (Rbs) last week (ends15Dec14), heading to the building with a megaphone, a camera crew and a placard featuring the face of the firm's former boss Fred Goodwin, who left in disgrace amid billions of dollars in losses.

Brand was caught on video facing off with an employee who was making his way back to work. In the footage, the star is giving an interview to the press when he overhears a man muttering criticism of the stunt and accosts him to put his views across.

The man in film, identified only as Jo, has now written an open letter to Brand expressing his anger over the stunt, which inconvenienced "ordinary working people", and comparing him to a "school bully".

In the letter, which has been posted online, Jo writes, "On Friday, you staged a publicity stunt at an Rbs office, inconveniencing a hundred or so people. I was the lanky slouched guy... who complained to you that you, a multimillionaire, had caused my lunch to get cold... I'd been standing in the freezing cold for half an hour on your whim. What mattered to me at the time wasn't bonuses; it was my lunch, so I said so...

"I just got back from buying my lunch to discover the building's doors were locked, a film crew were racing around outside... and you were in reception, poncing around... Which left us - the people who were supposed to be in the building, who had work to do - standing around in the cold...

"You staged a completely futile publicity stunt. You turned up and weren't allowed in. Big wow... That's not a global conspiracy, Russell; it's basic security...

"I can honestly say that the only other people ever to talk to me the way you did were school bullies... Now I think about it, they used to ruin my lunchtimes too... Who did you inconvenience on Friday?... A bunch of admittedly fairly well paid but still quite ordinary working people, admin staff mostly... in order to accommodate the puerile self-aggrandising antics of a prancing multimillionaire. If you had any self-awareness beyond agonising over how often to straighten your f**king chest hair, you'd be ashamed."