Lets not forget St Mary's Church, Willesborough, near Ashford, which shares similarities with Upchurch and Bexley, but definitely can't be use for navigation.
Brookland, 'Clad' or 'reclad' in the fifteenth century? Recent survey of the Brookland belfry suggests that whilst some of the earlier timbers in the main tower show signs of weathering, this is not enough to show it was fully exposed to the weather for any long period of time, but instead periods of neglect to its other sheathing allowed weather ingress. This evidence implies the tower was always clad from the onset and that its current appearance occurred through a process of addition and adaption throughout the mid - late medieval periods and not as a single phase of alteration.