When his next club the Powerhouse closed in 1987, Knuckles moved to the UK for four months and DJ-ed at DELIRIUM!, a Thursday night party at Heaven (nightclub) in London. Chicago house artists were in high demand and having major success in the UK with this new genre of music. Knuckles also had a stint in New York, where he continued to immerse himself in producing, remixing, and recording. 1988 saw the release of Pet Shop Boys' third album, "Introspective", which featured Knuckles as a co-producer of the song "I Want a Dog."