 In August 1977, a scheme for voluntary early retirement was introduced in the coal industry for men aged 62+ with at least twenty years of underground service, with weekly payments up to normal pensionable age.In January 1977, unions became authorized to lodge a claim on behalf of workers with the Advisory, Conciliation and Arbitration Service for an improvement in terms and conditions of employment on the grounds that existing terms and conditions were less favourable than the relevant recognized terms and conditions for the trade in the area or, where these did not exist, the general level.In February, sections of the Employment Act 1975 were brought into operation dealing with the qualifying hours for part-time work, thereby entitling large numbers of part-time workers to the same rights and job security as full-time workers.