A concert pianist with Tourette’s Syndrome has accused Britain’s top orchestras of branding him “trouble” and refusing to let him play.

Internal documents seen by the Telegraph reveal that six separate orchestras coordinated a response after Nick van Bloss complained that by ignoring his requests to play they had discriminated against him.

The 51-year-old musician has been praised for live performances in London, Tokyo and Miami, but has felt belittled and mocked by leading orchestras in his home country.

In February, his agent sent letters to the Royal Philharmonic, City of Birmingham Symphony, Hallé in Manchester, Philharmonia, Bournemouth Symphony and Royal Liverpool Philharmonic accusing them of discrimination, which all denied.

But documents retrieved by van Bloss through a public access request and shared with the Telegraph paint a picture of institutions failing to address a serious complaint and working together to quash it.

“The emails display a hostile, mocking and pathological disregard for me and my complaint,” said van Bloss. “The main point of my concern was diversity. The orchestras are funded to promote and celebrate it, but they reacted to my complaint by asking for me to apologise for having called them out.”

Van Bloss's condition gives him thousands of tics a day, but these disappear when his fingers touch piano keys. He has only once had a spasm during a performance when he was 21.