(Reuters) – Britain’s Royal Mail and its largest labour union have agreed to engage in talks through the Advisory, Conciliation and Arbitration Service (Acas) to resolve their ongoing dispute over pay, the postal service’s parent company said on Monday. International Distributions Services said the opening session for the talks would take place on Oct. 25. The Communication Workers Union (CWU) confirmed the agreement in a separate statement, and added that more than 115,000 postal workers at the former British postal monopoly are to strike on Oct. 25. Royal Mail has been in a tussle with the C…