The Telecommunications (Licence Modification)(Standard Schedules) Regulations 1999

31.1  The Licensee shall not do anything, whether by act or omission, which has or is intended to have or is likely to have the effect of preventing, restricting or distorting competition where such act or omission is done in the course of, as a result of or in connection with, providing telecommunication services, or any particular description of telecommunication service, or running a telecommunication system.

For the purposes of this Condition such an act or omission will take the form of:

(a) any abuse by the Licensee, either alone or with other undertakings, of a dominant position within the United Kingdom or a substantial part of it. Such abuse may, in particular, consist in:

(i) directly or indirectly imposing unfair purchase or selling prices or other unfair trading conditions;

(ii) limiting production, markets or technical development to the prejudice of consumers;

(iii) applying dissimilar conditions to equivalent transactions with other parties, thereby placing them at a competitive disadvantage; or

(iv) making the conclusion of contracts subject to acceptance by the other parties of supplementary obligations which, by their nature or according to commercial usage, have no connection with the subject of such contracts; or

(b) the making (including the implementation) of any agreement, the compliance with any decision of any association of undertakings or the carrying on of any concerted practice with any other undertaking which has the object or effect of preventing, restricting or distorting competition within the United Kingdom.