The 68-year-old singer revealed earlier this month (Mar15) that she had not been approached to appear at the competition's 60th anniversary celebration despite being the first British act to take home the trophy for Puppet on a String in 1967.

The hit's songwriters Bill Martin and Phil Coulter have told Britain's Daily Mail newspaper that Eurovision bosses were right to leave her out of the concert because she has been publicly slating the track for years.

Martin says, "I am not surprised she is not invited. She's knocked Puppet since she sang it. I always want to tell her to give me the money back... According to her manager, she made a lot of money from it. She hadn't had a hit for several records prior to that, and Puppet gave her a number one all over the world. Yet she says it ruined her career. She's always running it down."

Coulter adds, "It's karma coming around that she hasn't been invited to the anniversary celebration."

The 60th anniversay show will be held at London's Hammersmith Apollo on 31 March (15). It will be broadcast on TV across Europe at a later date.