Based solely upon four late night admissions to A&E, two of which were by ambulance and none of which was alcohol related, I have to say in my limited experience, A&E was littered with people either presenting themselves, or arriving by ambulance, following incidents fueled by alcohol. Many of those in A&E had clearly drunk too much, whilst others had clearly been drinking, but were in the wrong place at the wrong time. And of the admissions, only one was on a Friday night.
When my one of my daughters was a nurse in London, she did a stint in A&E. Her feedback, again anecdotal, was that alcohol played a part in most of the patients seen in A&E during the hours 9pm to 3am.