I went to see St. Mary, Bow Road, but at a bad time as there was a service with a surprisingly large congregation considering it’s on a roundabout.   Some of it at least is fourteenth century, but the tower looks later, partly because it was rebuilt after the war.   It owes its preservation to the failure of numerous plans to rebuild it in the nineteenth century and to CR Ashbee who oversaw a conservative restoration in the 1890s:-

This is the west window, which looks fungoid:-

The roof:-