BNP Secretary General Mirza Fakhrul Islam Alamgir left the country for London, UK on Saturday morning on a 10-day visit.
He along with his wife Rahat Ara Begum, departed from Dhaka's Hazrat Shahjalal International Airport on a Biman Bangladesh Airlines flight at 8:25am, said BNP media cell member Sayrul Kabir Khan.
He said the BNP leader is expected to return to home on December 11.
Fakhrul ready to embark on London tour
According to BNP sources, Fakhrul is travelling to London to meet party Acting Chairman Tarique Rahman to discuss political and party matters.
Once Mirza Fakhrul returns, BNP Chairperson Khaleda Zia may travel to London for medical treatment.
The 79-year-old former Prime Minister is likely to first receive treatment in the UK, and may then travel to the United States for further care.