I see your point, but it is 1 night a year and hasn't happened for 4 years or whatever! Dangerous precedent to set. If Spurs/Arsenal , Utd/City/Liverpool, Sheffield clubs etc can manage it far more regularly and over a longer period then Sussex police and the club need to learn lessons.
Do you really think police would ever justify 'advising' that without resource?
We're not even talking about any major disorder, fights etc.... we're talking under 5% of the allocation with pyrotechnics / fireworks etc