I have taken a look http://www.postoffice.co.uk/sites/default/files/Fair...
and item 2.2 states that current unlimited customers will be restricted in speed for excessive use. This is a major variation of contract which should give users the right to leave with no penalty. Conveniently there is no mention of that right.
I see the Post Office are offering a new package including anytime calls for £30.55. By the time you add caller display, you would be better off paying another 3 or 4 pounds for the totally unlimited B.T. service, which includes free Wi-Fi.
they are allowing customers to leave for free, before the fup went live they had this document up, seems it not ther no more. it said
1st June 2012 Post Office® Broadband Fair Use Policy Changes
The Post Office® Fair Use Policy has been amended and the new policy will come in
to effect on the 1st June 2012. The Post Office® has amended the ‘Usage Guidelines’
and ‘Fair Usage Policy Enforcement’ sections of the policy.
The new Fair Use Policy can be found on the Important Information TABs of the Home Phone, Broadband Standard, Broadband Extra, Home Phone with Broadband Standard and Home Phone with Broadband Extra product pages.
Because the introduction of the new Fair Use Policy is a material change to the Post Office® Broadband Extra Terms and Conditions, you have the right to terminate your Post Office® Broadband Extra service without incurring early termination charges.
Please see the Terms and Conditions for Post Office® Broadband Extra Customers
for further information.
If you wish to discuss these changes to your Post Office® Broadband Extra service, please call 0845 600 3210 and select option 1 and then option 4.