He will possibly be taking the 850mm from ADB, this differentiates between 750mm and 850mm exits. (60 persons and 110 persons respectively) Since the building is up and running, the CLG guidance is clearly the most appropriate, and that doesn't differentiate between the two sizes. i.e 100 persons for 750mm, with an extra 15 persons for each extra 75mm, so in your case 115 persons if the premises is 'normal' risk. Approved Document M gives 800mm as a minimum for a head-on approach.
However, I vaguely recall some research somewhere that shows that people can pass through a 850 door marginally quicker than a smaller door, as they take less time to 'line themselves up with it', and following this any slight narrowing of the corridor won't have the same impact as the initial width of the opening that people have to aim for. People are simply walking single file and their speed should not alter until the corridor is considerably narrower than 830.
One question I would have is why is the licensing officer concerning himself with what is essentially a fire safety matter?
From the guidance regarding the Licensing Act 2003:
"Licensing authorities should note that under article 43 of the Regulatory Reform (Fire Safety) Order 2005 any conditions imposed by the licensing authority that relate to any requirements or prohibitions that are or could be imposed by the Order have no effect."
"In most premises existing legislation will provide adequately for the safety of the public or club members and guests. However, where this is not the case, consideration might be given to the following conditions."
