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“There were certain songs on the guitar I just couldn’t play, and my plectrum was getting stuck in the strings, so that was a bit of a red flag,” he says.

In the BBC interview, the singer-songwriter said he first suspected something wasn't right when he began having trouble grasping his guitar plectrum.

Bobby Zamora came on recently and I have actually got a plectrum signed by him now - I can tell you that is officially the only one in existence.

As well as innovative collaborations he also created his own plectrums using dentist's acrylic and sometimes plucking his guitar's strings with objects such as pebbles and shells.

And from the off, he was untethered from the stage, running up and down the crowd barriers to pose for selfies, clasp people's hands, hand out plectrums and read their signs.