A fight which left a man in hospital with head injuries is another nail in the coffin for a problem pub.
The Manor in Field End Road, Eastcote, was warned only two months ago by police because of the growing level of trouble.
Now the latest incident on Saturday night could lead to the pub's licence being reviewed.
Sergeant Ian Meens, the licensing officer for Hillingdon Police, said: "We have been unhappy with the way things are going at the pub.
"The problems have been building up this year, so I had a meeting with the landlord, and as a result the pub has stopped playing urban type music, which has driven away some of the more hardcore boys.
"There has certainly been a great improvement but it's on the edge now after the incident on Friday.
"I need to find out what exactly happened, but there's a good chance the pub's licence will be reviewed.
"It's another nail in that coffin for them."
One Field End Road resident, who asked not to be named, said: "People who drink in Eastcote are well aware The Manor attracts a younger and far more hostile crowd than other bars in the area.
"My bedroom overlooks the high street, and at closing time the road becomes a melee of smashing glass, police cars, ambulances and raised voices, and this often leads to violence."
Donal Kilcommons, the pub's landlord, said: "We would like to stress that this is an isolated incident.
"Providing a safe environment for our customers is of paramount importance.
"We are working hard to increase the pub's appeal to women and families by focusing on good quality food.
"We have also greatly reduced live music at the pub and a recent refurbishment has created a more relaxed, family friendly environment."
The 37-year-old victim of Saturday's violence was injured just after midnight outside the pub door. He was taken to hospital and later discharged.
Detective Sergeant Andy Dawson said: "This incident is being investigated. If anyone was in the area or has further information that could help us with our inquiries please call 020 8246 1472."
To remain anonymous call Crimestoppers on 0800 555 111.