Best of luck to them – they will surely need it with all these conditions – they are near identical to what clubs in Ipswich have been faced with at various points following the murders in 2006 and some other incidents (more directly related to nightlife) in subsequent years.
Not sure if the 19 years age limit really makes sense, I don’t think youths of 19 are much more mature than at 18 (I wasn’t anyway) and ID scanning tends to put me off venues – as I have concerns over what else the scanned data could be used for (even if the advertisers don’t use it directly its also a list of young people with hedonistic lifestyle choices that insurers etc might want).