Royal Buffet in Lewisham

this is my usual place to have coffee on my days off. Its all good but there is one major flaw. There wasnt even one single time i sat there, when i wasnt bothered by some passer by non customer to come ask for money, for cigarette or just rudely sit on MY table without asking. There is a well known number of disturbed individuals,loudly talking to themselves,approaching customers and interupting their coffee time.They do not order anything. The staff sometimes is trying to chase them away but most of the time they dont do anything and just let them bother ppl. Owner should know that it is hurting their business and it reduces the overall experience.