LONDON, Sept. 11 (Xinhua) -- EU chief Brexit negotiator Michel Barnier (L) walks to Britains Department for Business, Energy and Industrial Strategy in London, Britain, Sept. 10, 2020. Senior officials from the European Union (EU) and Britain met in London on Thursday for hastily arranged talks over a controversial Brexit bill as British Prime Minister Boris Johnson intended to override key parts of the Withdrawal Agreement previously agreed with Brussels.