Ah but froggy, you forget that Brits have been programmed to believe that REAL guns are like movie guns where everyone shot dies and that the bad guys are expert shots, which in the main they are not. Because the sheeple have been terrorised to fear guns it's unlikely that they would do anything but give up.Froggy: Rally as many of the other potential victims as possible to have a group "rush". In the 1,5 secondes it takes to run 8 meters the shooter can merely fire more than 3/4 rounds that will be badly adjusted due to the projectiles just thrown. As shooters, we all know a bullet does not have a magical guiding system that will make them hit every single fast moving targets...
Hide??
Get out - fast! Hiding has been shown to be ineffective as by the time help does arrive and eventually enter the building the bad guys have had time to look for you. That happens.
Hiding is a last resort; school and other shootings have shown admirably that hiding in a room is a sure fire way of getting killed.
In all of the "advice" out there, few give advice on how to improvise weapons etc etc - In the UK that would probably be seen as "unacceptable" and inciting violence" and be frowned on deeply by Plod. There is also the question / issue of how the population has been dumbed down to the point where being a victim is morally superior to seriously injuring or maiming the nutter trying to kill you!
Realistic training in the workplace can be counter-productive for employers with people claiming to be traumatised, terrified etc etc etc etc - nanny state has won.
At any rate, it's down to mindset and the will to survive.