The fine has been issued following an Ofcom investigation....
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The postal service is preparing for its "busiest period" of the year....
A committee of MPs claims the postal service has "systematically failed" in its duty ......
It's part of a long-running dispute over pay, jobs, and conditions....
The nation's postal service currently employs 140,000 people right across the UK....
Picket lines of striking staff and supporters have been forming across the UK this ......
