Too many Estate Agent Boards

At the end of Hollwell Place on the bridge for almost three weeks were a mass of agent boards, I am glad that these have minimised at last to two on one pole.  All over Pinner we are under seige by Estate Agent Boards.  The boards which declare a property or has been sold should not stay up longer than a week or two!  I think Harrow should charge the agents for putting these up.  After all advertising posters need planning permission before the boards can be erected!