mikes86, if you are concerned about repeated episodes of threatening behaviour in the area, contact the local Met SNT http://content.met.police.uk/Team/Lewisham/ForestHill
I've always found them to be very helpful and keen to address issues that are brought to their attention....there is a one to one drop in surgery at Forest Hill Library on 19th Dec where you can speak to the PCSO's who are out on patrol in the area. Go along and talk to them.