Do I Need Planning Permission.co.uk
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A complicated situation, that I will summarise. Someone applies for planning permission, and at a planning committee meeting it is given permission. However, that permission won't be made official until extra information to clarify an aspect of the application is given that satisfies the planning officer. The information is a mere formality. How long can the applicant string them along without giving the information? For instance, could they wait years, and not have to return to a planning committee who may have new concerns and aspirations for the area? To be clear, permission has NOT yet officially been granted and the time limit of 3 years has not begun.

The question you raise is an interesting one. If you say that the appplicant has to supply that information, then in my opinion the emphasis is upon them to do so as quickly as possible in order for the permission to be issued. Whilst the planning committee may have accepted the principle of development, it is not until the permission has been issued that the clock will start ticking in terms of the 3 year rule.
I hope this helps.