Vehicle entrance plate issue

Today I have parked in the Mount Car Park in Princes Risborough and am very concerned with the condition of the vehicle entrance. A metal plate that presumably used to form part of the capacity monitoring system is now worn and loose so that any vehicle passing over is liable to damage. More relevantly it is a bad trip hazard for pedestrians as it is adjacent to one of two pay machines and, in exiting the area, I caught my foot on the bent metal plate, nearly falling - which at 82 years of age would not be good. I do not know whether this or "fix my street" is the best method of drawing this to the attention of the authorities? I do have photographic evidence of the problem but no obvious method of uploading pictures appears with this contact method. I await some response.