In addition to your own and Kurnals suggestions:
A bit of an obvious one, but: Any alteration affecting the means of escape/structural members etc should possibly have Building Control approval.
If the sprinkler system is to be taken out of action during the refit (Often a good idea to stop clumsy workmen knocking heads off) then the shop front should be made fire resistant from floor to ceiling.
Class 1 linings as per ADB. (Although in reality they will then attach racks of readily combustible clothing etc to these walls...)
Ensure the lobbies at the rear of the unit are maintained. (These can often somehow turn into tea rooms/coat storage areas etc)
Any music broadcast system should silence upon activation of alarm.
No materials/substances introduced that may change the standard of sprinkler coverage etc from OH3, or sprinkler system updated to comply appropriately.
They should be aware of where fire shutters are used so as not to obstruct their movement with displays/signs etc. (Not many shutters will be actual fire shutters, but it is almost guaranteed that the ones that are will end up obstructed.)
Also for them to be aware if window drenchers are installed so they do not put posters on the windows.
And to add to Jaspers comment re dust: Ensure any covers are removed upon completion of the works.

Note: "CompetEnt"