KeithG has this one. It is indeed a detail of a portion of the decorative iron work on the south door of Staplehurst church. Supposedly representing the Norse tale of Raknorocok, the Norse doomsday, the iron work is supposedly earlier than the timber door. This is implied by the semi-circular decoration typical of Romanesque architecture, whilst the door timber is shaped to a two pointed arched opening of the early English period.
Over to you KiethG