Twitching limbs, repetitive head shakes, these are things that would dishearten the average pianist….but not so classical pianist Nick van Bloss, who will play to a 900-strong audience in Chelsea later this month, despite suffering from Tourette’s syndrome. The performance will be his first in public for 15 years.

Since childhood, van Bloss had suffered with vicious nodding, uncontrollable vocal sounds and a compulsion to punch himself in the stomach but was not diagnosed with the condition until he was 21.

At the age of 11, a free piano gave him something else to occupy his mind. He told The Guardian: “They [my parents] thought it would give me an interest, seeing as I didn’t fit into anything else. But it turned out to be more than an interest; it was an absolute love affair and it was completely requited.” To the surprise of Nick and his parents, the tics that plagued him during very waking moment stopped the moment he began to play.

The Royal College of Music beckoned and, before long, van Bloss was invited to play at the Chopin festival in Warsaw 1994, no mean feat for any highly trained pianist.

Sadly, as the Tourette’s began to overwhelm him, Nick was forced to retreat to the privacy of his home. Still playing for up to 15 hours a day, and following a battle with lymphoma, van Bloss also wrote a book about living with Tourette’s entitled Busy Body.

Now, he is ready to return to the public eye with a performance of Bach’s G Minor Keyboard Concerto. “The tics will go away as soon as I start to play, I have absolute confidence,” he says.

Embracing his condition rather than fighting it, he adds: “It is a fundamental part of me.

“I am a person with Tourette’s who happens to be a pianist and a musician. That’s really my identity – not the freak pianist.”

Nick van Bloss will perform with the English Chamber Orchestra at the Cadogan Hall in Chelsea on 28 April.