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20. Cancellation Rights

You may cancel the Services without penalty in the following circumstances:-

(i) if We increase our Charges You may cancel those Services in respect of which the Charges have increased by giving Us one month's notice in writing within 30 days of the earlier of:

(a) such price increase being notified to You under Condition 6.2; or

(b) the date of your first bill following such price increase, irrespective of whether the minimum period in respect of those Services has expired. If You cancel Services under this Condition, the increased Charges relating to those Services will not apply to You;

(ii) if We significantly reduce the content of the Services or make any significant change to the terms and conditions of this Agreement under Condition 26(iii), You may terminate this Agreement by giving Us one month's notice in writing within 30 days of such change irrespective of whether the minimum period in respect of such Services has expired

http://www.ntlhome.com/legals/residentialterms.html