The Walker Brothers continued to have chart hits in the UK in 1966 and 1967, with Scott taking a more prominent role in their song choices and arrangements, but with diminishing commercial success. They also had to leave the UK for six months in 1967 because of work permit problems. As pop music moved on, the Walker Brothers began to sound dated. By the end of 1967, the pressures of stardom, internal tensions and 'artistic differences' began to weaken the group. After a UK tour in April 1967, which also featured Jimi Hendrix, Cat Stevens, and Engelbert Humperdinck, followed by a tour of Japan in 1968, the group officially disbanded.