Cambridge Folk Festival is launching legal action to recover monies owed by an online ticket distributor.
BBC News reports that the City Council, who run the festival, are looking recoup £618,000 in ticket sales, which they are yet to be paid.
Speaking about the legal proceedings, leader of Cambridge City Council said: "We are taking this matter extremely seriously given the large sum of public money involved.
"This company sold folk festival tickets for us in 2007 and they did a satisfactory job. They were appointed again for last year's festival after a competitive process.
"They haven't paid up even though we have given them extra time to do so. Clearly we have been very badly let down and we are not going to wait any longer. That is why we are taking legal action."
SecureTicket UK were used to sell passes online since December 2007.