The chair of a committee of MPs has written to the London Stock Exchange with concerns over the fashion retailer.

A Shein representative declined to provide a direct answer when asked by a British parliamentary committee on Tuesday whether the online fast-fashion retailer uses cotton from China, a key issue for potential investors concerned about its supply chain.

A lawyer for Shein summoned to a British parliamentary hearing has evaded questions on whether the fast-fashion giant sells products containing cotton from China.

Yinan Zhu declined to say whether it retailer's suppliers used Chinese cotton amid concerns over forced labour.

A representative of fast fashion clothing brand Shein repeatedly refuses to deny that the company uses cotton sourced from China, where practices are widely speculated to use modern slavery.