fliers on my days off for more than 30 years.

"I was told when I became a central government employee in 1972 that engaging in political activities may result in punishment," he admitted.

However, his lawyers argued it was well-known that some government employees become involved in political campaigns, notably when former civil servants run for the ruling Liberal Democratic Party or union leaders stand for opposition parties.

This political involvement has been allowed to continue almost unchecked for more than 30 years since the 1974 ruling on the postal worker, they said.