Liverpool is a city in England, on the planet Earth.
It was the home city of David Lister. Lise Yates was also from the city. The Aigburth Arms wa one of Lister's favourite pubs.
Lister spent his youth scrumping for cars in a part of Liverpool where the cars were frequently on fire (RD: Justice, Back to Earth). He had a job parking trollies at a supermarket in Liverpool for ten years before joining the Space Corps (RD: Waiting for God).
Rimmer once believed that he had moved to Liverpool and had a relationship with Lise Yates, whereas it was one of Lister's memories that had been placed in his mind (RD: Thanks for the Memory).
The Aigburth Arms was the pub where the baby Lister was found, placed there by his adult self, and where he played pool as an adult (RD: Ouroboros, RD: White Hole).
Liverpool at Wikipedia