LONDON (Reuters) - The chair of a British parliamentary committee wrote on Thursday to the chiefs of the Financial Conduct Authortiy and the London Stock Exchange about Shein's lack of response to lawmakers' questions about its supply chain at a committee hearing this week.

"The Committee was profoundly concerned at the lack of candid and open answers to some extremely simple, basic questions about the integrity of Shein's supply chain," Liam Byrne, chair of the business and trade committee, wrote in the letter to the London Stock Exchange CEO published on Friday.

(Reporting by Helen Reid, Editing by Matt Scuffham)