Cheryl Baker, Mike Nolan and Jay Aston were "bitterly disappointed" to hear the court ruling in favour of former 'Bucks Fizz' band-mate Bobby G that will prevent them from performing under the name 'The Original Bucks Fizz'.
Bobby G and his wife Heidi Manton, who owns the trademark for the name, are still members of the latest incarnation of 'Bucks Fizz'.
The three original members of the band attempted to revoke the trademark and took Bobby G to court, hoping to stop him from using the name as they claimed it misled fans.
Their lawyer, Dean Dunham, said: "They never wanted it to come to this, Bobby G was the aggressor. There is overwhelming evidence to show the public are being misled."
"Bobby G's group even had posters showing the winners of Eurovision in their advertisements."
At the hearing, which took place at the Intellectual Property Office on 15 July, the court heard that fans of the original Eurovision-winning group had bought tickets to see 'Bucks Fizz' only to be disappointed that the group now only featured one original band-member, Bobby G.
However, the court said that it was the name 'The Original Bucks Fizz' that caused confusion and ruled that Bobby G, real name Robert Gubby, could use the name while his former band-mates would have to stop.
Mr Dunham said: "It is totally the wrong decision. We are going to appeal to the high court. I am confident we will win the case."
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