When built, the main entrance was in the middle of the north wall. This, too, has now been filled in. The church has a nave and two narrow aisles and is of five bays. There are two rows of five Ionic columns and two semi-columns, running from West to East. The columns support an entablature, which is broken in the middle and turned to the outside walls, effectively forming transepts. The columns are evenly spaced, except for those in the middle. With the original round-headed windows in the centre (now replaced by round windows), this would have given St. James a strong North-South axis. The cross-axial design was a conceit also used by Wren in St Magnus the Martyr and St Martin Ludgate. Subsequent rearrangement has made this less apparent.