London's position as a financial centre was also discussed at the briefing with Shriti Vadera.
Sri Mulyani joined Asia House corporate members straight from the G20 finance ministers' meeting.
The former WTO Director-General also discussed the Brexit process, naming it "long and complex".
Leading foreign correspondent Christina Lamb will open this year’s Festival.
Mohsin Hamid gives an exclusive interview to Naomi Canton about his latest novel Exit West.
Choo Waihong talks about her debut book which is based on her experiences with the Mosuo tribe.