And yet the thing I remember most was the fearless way Jonathan opened up about his depression and the lowest points of his young life with frankness and humility. Last time I interviewed the opera prodigy he was riding high on his post-Britain's Got Talent success and was ready to go solo without Charlotte.Jonathan's debut solo album will be released in October, with Charlotte bringing her album out earlier, in June.Sony Classical will be supporting them in their dream of Jonathan becoming an operatic Tenor and Charlotte being inspired by her love of classic musicals and great ballads. Sam Kelly, from East Anglia, was keen to show us his feminine side: pink pants and a scarf tied round his guitar. Being Welsh, I was rooting for Only Boys Aloud to come second: the choirmaster was like someone out of an Alan Bennett play. His performance was flawless, and sweet in its ordinariness. I don’t care how much fun they had, I want to be entertained! But it had to be the bashful Jonathan with his big girth and even bigger voice and partner Charlotte, who is a sweetheart. David Walliams joined the Show Bears onstage in the campest thing I’ve seen since Glastonbury, and Susan Boyle came on while votes and Aquabatique’s verrucas were counted: no one would have thought her remarkable if she had Amanda’s body. Jonathan and Charlotte rather shockingly came second, while Pudsey was the winner!
Jonathan freely admits that he was that person - before adding with a beaming grin, "but that's not me now."Strong, articulate and surprisingly playful and sweet, he was an absolute pleasure to hang out with as he promotes his debut solo album Tenore.
The goal of art and making music is to bring people together and make them feel something."One thing I bet Rihanna can't do is beatbox and Jonthan blows me away with some impressive skills.
I point out that Britain's Got Talent could have been very different and he laughs: "It really could have been potentially way more interesting."He also gets feisty talking about his lifelong love for Pokemon and disappointment with the new Pokemon Go game.
But Jonathan told me that "our time came" and the partnership ended earlier this year so that both could pursue their solo careers.
Of course, at their first audition for Britain's Got Talent in March 2012, Simon Cowell famously suggested that Jonathan should ditch Charlotte from the start and go solo.
In a statement, Jonathan and Charlotte said: "We have had the most exciting journey together ever since meeting at West Hatch High School in 2006 and are so happy for each other.