POSTAL delivery changes could hurt local firms, says a businessman.
But Royal Mail says that although the changes are being discussed nothing has been decided.
Huddersfield delivery office manager Darren Banks is considering changing shift patterns in a cost-saving exercise.
These include the removal of 13 walking routes and some night work.
According to a letter from Mr Banks to Communication Workers' Union representative Simon Midgley he is also suggesting moving walking duties to 7am, driving duties to 8am and part-time duties to 9am.
The current start time of 5am allows for delivery to businesses in Huddersfield town centre about 10am.
The businessman, who did not want to be named, fears the changes could harm his firm.
He said: "We need our post first thing in the morning. It would be inconvenient to make these changes."
And he says he wants Royal Mail to be more open.
He said: "I want to know what's going on, so I can plan accordingly."
CWU spokesman Bob Hulme said a new law could lead to some shift changes at the Huddersfield delivery office.
He said: "From January 1 vehicles over seven-and-a-half tonnes have been restricted to 56mph, so mail is arriving at the office later than before.
"But I can assure businesses that they will receive the same service."
ARoyal Mail spokesman said: "We are currently considering a number of proposals for improving the efficiency of our operation at the Huddersfield delivery office."
He denied that a decision had been taken.
He said: "We do not know at this stage which of those proposals will be implemented or what the impact might be."