Founder member of the band, Jones had died in 1969 after he drowned in his swimming pool at the age of 27, reported Contactmusic.
"Shock? Brian dying? No. It was very sad but it wasn't unexpected. We'd carried him for a few tours and he was quite ill.
"We were young, we didn't know what was wrong with him. I still don't really. He always suffered from terrible asthma, and he drank heavily on the road and he got into drugs before anyone else in the band," Watts said.
"'Misgivings? Yeah, oh yeah, I always do. It's a young person's (game). The thing I find difficult is that 50 per cent of it is image, not my side of it, but it is, and as you get a bit older you think, 'Oh God!', " he added.