Condition of flint wall around Bpas Old Shoreham Rd

I am concerned about the condition of the wall around bpas particularly the Old Shoreham Road side, as I regularly walk past it.  Not from a safety point of view but from a concern about the lack of maintenance, particularly on the top of the wall where the concrete capping seems in poor condition and overgrown with plants etc.  The flint infill sections are also lacking pointing.    These walls are a great asset to the area and do need to be maintained. Does anyone know if the wall is listed or protected in any way?