Essendon church is, externally at least, a handsome (if a little pompous) Gothic Revival building in the style of the early 14th century, dating from 1882-4. (The tower is 15th century.) The limestone chequerwork relieves what would otherwise be unrelenting expanses of knapped flint (never the most attractive material). The architect was William White (1825-1900), who restored Bengeo and Sandridge.
The interior is one of the most Stygian I know, even on a bright sunny day with the lights on. There is one outstanding object that makes a visit most desirable: this is the black basalt jasperware Wedgwood font of 1778, one of only five made. Unfortunately it's not currently on display. (A photo and more information about it can be found here.) Instead the original wooden pedestal bears a photo of itself and the font, like a piece of conceptual art.