Sir Bruce Forsyth has intensified his war of words with Simon Cowell, while also revealing he’ll be performing at this year’s Glastonbury Festival.

The showbiz veteran, who will be singing songs from his solo album These Are My Favourites at the festival, said he was a fan of Britain’s Got Talent, but was worried about children suffering ’emotional damage’ from the pressure of performing.

Writing in the Daily Mail, he said: “I really do think he should stop putting young children under the immense and possibly damaging pressure of performing on national television, not just in front of a live audience, but also before four very sharp judges.

“You can see that many of the adult performers find the experience traumatic, so what sort of emotional damage could it be doing to children who, for the most part, are only there because of the ambition of their parents and teachers?”

The Strictly Come Dancing host recalled watching a young girl sing on one of Simon’s shows a few years ago before she broke down in tears halfway through.

He said: “She was only 10 and clearly the occasion and the pressure just got to her, but I remember we were watching at home and I just turned to my wife, Winnie, and said ‘This isn’t right; this shouldn’t be on television.'”

The 85-year-old also wrote in the newspaper that the one-man show at Glastonbury was ‘A bit of singing, a bit of dancing, a bit of piano (a lot of people don’t know I play piano) and an awful lot of laughter, I hope’.

Among the unlikely names to have previously played the event in Somerset are Welsh rocker Shakin’ Stevens, Rolf Harris and Dame Shirley Bassey.

The Wombles played the festival in 2011 – sparking speculation that organisers had made a mistake and were meant to book Liverpudlian indie rockers The Wombats.