The boss of struggling newspaper publisher Johnston Press faces growing pressure, as an activist investor prepares to launch a campaign against the debt-saddled company's management. It is understood Crystal Amber, the fund led by Richard Bernstein, will meet with Camilla Rhodes, Johnston Press's interim chairman, before the end of month. The fund plans to discuss with Ms Rhodes the possibility of finding a replacement for chief executive Ashley Highfield, as one of several options to revive the company's fortunes.