withdraw the requirements specified under section 705(1)(b) for any description of arrangements and any certification made by reference to those requirements, or

vary those requirements and withdraw any certification made by reference to them.

specify the date on which it is to take effect, and

give notice of it F1... at least F215 days before that date to the provider authorised under section 707 to enter into contracts under the arrangement concerned.

the operation of the arrangement concerned before that date,

contracts made under that arrangement before that date, or

where the notice so provides, contracts which are of a description specified in the notice and are made under that arrangement after that date.