Earlier titled as 'Atithi In London', 'Guest iin London' is a comedy entertainer featuring 'Pyaar Ka Punchnama' fame Kartik Aaryan in the lead role. Paresh Rawal and Tanvi Azmi plays significant roles in the film and Ajay Devgn appears in a cameo. The film is inspired from 2010 acclaimed movie 'Atithi Tum Kab Jaoge'.
The story begins with an odd old couple from rural India paying a visit to a young couple who live in the suburban lands of London. Their unwanted visit leads to a series of misadventures which lives the couple, played by Karthik Aaryan and Kirti Kharbanda, embarrassed. At the same time, the film also captures the socio-cultural differences between the east and the west, while showing how each one is connected emotionally and care about each other.