The Post Office is to adjust the fair usage policy on its Broadband Extra package, it has been reported.
According to ISPreview.co.uk, the broadband provider will change the terms of its policy from June 1st 2012 to ensure compliance with new advertising rules.
The provider is imposing a soft usage allowance of 100GB on the broadband deal, although consumers will not be fined if they exceed this.
"If your usage exceeds 100GB in any month, we may write to you to request that you moderate your usage," the Post Office stated.
"If your usage subsequently exceeds 100GB in two consecutive months or for a fifth month in any 12-month period, we may contact you again asking you to moderate your usage, and warn you that we may reduce your internet access speeds, download speeds and upload speeds."
The broadband provider said that if the service is used excessively for a third month, or for a sixth month in any 12-month period, action may also be taken to throttle performance.
However, the Post Office said it will contact customers before reducing the speed of their service.