Vaijnath Hanpanwar (Bharat Jadhav) is a simpleton, living in Kalchoudi village near Satara in Maharastra. His mother passes away and a miserable Vaijya mourns alone for her. He has never known his father, but soon learns that he, Omkar Hanpanwar (Mohan Joshi), had left his mother when Vaijya was just three years old and gone to London to earn a livelihood. He had never returned.
Vaijya finds a small box containing several uncashed cheques, flight tickets to London and many little things alongwith a visiting card. He decides to meet his father and return some of his belongings that he found in the box. The father learns of his son's impending visit and decides to test him. When the two meet, mundane activities between the two propel them into interesting and laugh-riotous situations. A clean, funny entertainer, 'Mukkampost London' is sure to keep you in splits.