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(a)     prohibit the adoption of telephone numbers by a communications provider except in cases where the numbers have been allocated by OFCOM to a person;

[(aa)     impose tariff principles and maximum prices for the purpose of protecting consumers in relation to the provision of an electronic communications service by means of telephone numbers adopted or available for use;]

(b)     regulate the use by a communications provider, for the purpose of providing an electronic communications network or electronic communications service, of telephone numbers not allocated to that provider;

(c)     impose restrictions on the adoption of telephone numbers by a communications provider, and on other practices by communications providers in relation to telephone numbers allocated to them;

(d)     impose requirements on a communications provider in connection with the adoption by him of telephone numbers;

(e)     require an allocation of particular telephone numbers to be transferred from one communications provider to another in the circumstances provided for in the conditions;

(f)     impose such requirements and restrictions on a communications provider from whom an allocation is required to be transferred as may be provided for, in relation to the transfer,