The Pakistani Tehreek-e-Insaf (PTI) was denied permission to hold a briefing in the main meeting room of the UK Parliament's central building.
According to details, despite an invitation to international media, no representatives attended the event.
Between seven to ten British Members of Parliament (MPs) participated in the briefing, three of whom were of Pakistani descent.
However, due to the low attendance, journalists from Pakistan were not invited to the event.
Aneel Mussarat and Jehangir Chiku were also not permitted to enter the British Parliament premises. PTI senior leader Zulfikar Bukhari blamed the administrative authorities for the disruption.
Differences within the PTI leadership in London regarding the event were also openly revealed.