I live in a block of flats one tenent keeps ignoring the fire law by leaving rubbish in the common ways or managing agent can't get him to stop so who can we go to now. Who polices the law when the managing agent can't please help thanks

It is up to the Responsible Person in this case it is the managing agent and it his their responsibility to keep all escape routes clear (art 14 (1)) and if they do not they are committing an offence. The enforcing authority is the Fire and Rescue Service (FRS) and if the managing agent cannot comply with the fire safety order you should contact the FRS.