If the person contacts you to ask for more time to comply you
can, if appropriate, agree a revised time scale for production of
the information.
Send a letter to the person (copied to the agent where one is
acting) saying that you have agreed to allow further time for
compliance with the Formal Information Notice dated dd/mm/yy. The
information should now be provided by dd/mm/yy. You will not take
any further action until this date has passed.
If you are unable to agree a revised timetable, you should
seek approval to commence penalty proceedings.