Question regarding the river Thames permission, up until Barrier Thames it's ok after purchasing the license from PLA, then the sea foreshore is ok by the crown regulations. What about the parts inbetween? Would I need to ask Essex and Kent councils? I know that kayaking on the tidal parts of river is being seen as kayaking on the sea and the same regulations regarding permit apply so was wondering if anyone knows anything about that part? End where does actually river Thames ends?