I'm the king of the castle.
Finally. At the third attempt. The previous two times I presented myself at the ticket office only to find the keep was closed for repair work.
Rochester Castle is the largest Norman keep in the country- larger than the ones at Dover or the Tower of London. It's in fairly good repair too- and I don't see why- apart from the expense- they don't put the floors and roofs back in and turn it into a museum of medieval life.