This story from Reuters regarding the incident in London on Tuesday night says that "Witnesses said Kay was head-butted, suffering facial injuries, but his agent said a concert planned for Wednesday night would still go ahead." It goes on to say "Kay's agent said a scuffle began when the singer found his brand-new car damaged and confronted the suspected culprit." The car in question, according to NME, is a £70,000 Bentley.