Nicola Edgington has been found guilty of the murder of grandmother Sally Hodkin and the attempted murder of another woman, Kerry Clark in a knife attacks in Bexleyheath in 2011.
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Currently the Ealing Council has a huge shortage of suitable space and sees these steel well insulated boxes as a cheaper alternative.
Staff at Envirowaste in Leyton say the medal may have been left within a piece of furniture and thrown away accidentally.
If approved the increase would trigger a county-wide referendum.