Smoking in Brent Parks

Someone in Boris Johnson'd office thinks it smart to ban smoking in London parks.  In fact Boris Johnson only controls a small number of parks.  Most of them are under Borough control.  For example, Brent has about 85 parks ranging from huge ones like Fryent Country Park to pocket parks like Challenge Close or Tubbs Road.  The only public park in Brent not under Borough control is Queens Park, which is under the City of London.  So the real question is: what will each of the Boroughs do?