​Susan was elected as a Harrow Councillor for Hatch End Ward in 2006.  She was given a cabinet position responsible for the environment and community safety in 2007 and became Deputy Leader of the group in 2008. Susan became Leader of the group in 2010 and she took over as Leader of the hung council in 2013, returning to opposition Leader in 2014.

Susan became a London-wide London Assembly Member in June 2017 and is currently the Leader of the Conservative group on the assembly.

​Her passion lies in community safety in all its forms. She was appointed to the London Fire and Emergency Planning Authority in June 2010.