When we were there 2 weeks ago, I met a few regular patrons and asked them on their views on the "6.5 metres ".
One guy, who visits once a month, said that the signage is misprinted. The 6.5 metres is the maximum lenght of the mh from the front bumper to the rear of the back wheels. In other words when the rear wheels are touching the curb at the grass, your front bumper must be inside the parking bay. He said that the bye laws passed by the council reflects this but the signage graphics are wrong and the caretakers allow for this.
Malcolm