Victimisation: Employer went beyond what was reasonable

In St Helens Metropolitan Borough Council v Derbyshire and others [2007] IRLR 504 HL, the House of Lords held that an employer that wrote to a number of equal pay litigants and their colleagues warning of potential job losses if they continued with their claims victimised them contrary to the Sex Discrimination Act 1975. The tribunal was entitled to find that the employer's letters went beyond what was reasonable in seeking a settlement, and amounted to subjecting the claimants to a detriment "by reason" that they were persisting with their claims.