evidence: More than 70% of working mothers have experienced pregnancy or maternity-related discrimination, a new report has shown. [...] Of the 77% of mums who reported discrimination, only 3% went through their employer's internal grievance procedure and less than 1% pursued a claim to the employment tribunal. [...] "We simply cannot ignore the true scale of the hidden discrimination that working mothers face," Caroline Waters, deputy chair of the Equality and Human Rights Commission said.