The representative of the Middle Eastern investor seeking a shake-up of Plus Markets quit the board of the troubled junior London stock market last week, it has emerged.

Hisham Al Otaibi resigned from Plus Markets with effect from 17 October 2011, according to Companies House filings. Al-Otaibi, who currently serves as a director of the Kuwait Stock Exchange, sat on the board as a representative of Amari Dhari Investments.