In order to facilitate the a hydrodynamic vortex (silt traps known as Hydrodynamic vortex ) installation for the Wandle Trust London Borough of Sutton intends to make a Temporary Traffic Management Order for closure of – Butter Hill: Sat 18th May to Fri 31st May. Closure of Butter Hill from Mill Lane to Elm Grove Parade/Vellum Drive. Diversions via Mill Lane and North Street, or Acre Lane/Manor Rd North. Parking restrictions along Mill Lane.