The film's plot surrounds Lemon's rags to riches story, after achieving success on the basis of a mobile phone with a lemon sweet stuck on the back.After receiving a rare 0% on Rotten Tomatoes, it is considered one of the worst movies ever made by critics.He apologises to his friends for ignoring them, and proposes to Rosie.
Despite Archimedes' advice however, Keith prefers his new celebrity lifestyle and decides not to return to Leeds, the Securipole business or Rosie.
Keith hosts a toga party at a luxury venue, but during the party he is confronted by Dougie, who tells him Evil Steve has kidnapped Rosie and is going to kill her unless he pays for the Securipoles.
The "Lemon Phone" becomes an overnight success, and Keith is instantly propelled into the life he has always wanted.
He becomes a household name, earns billions of pounds from the Lemon Phone, and starts dating Kelly Brook (playing an exaggerated version of herself) who, unbeknownst to Keith, is only dating him so she can divorce him and take his money later.
He travels to London to present the Securipole at an inventor's convention, putting his friend Dougie (Kevin Bishop) in charge of his business while he is away.