St Nicholas's has an aisled nave with no clerestorey. The S arcade is taller than the N and is entirely the work of R. C. Hussey (1864-65). Hussey's work dominates the N arcade too, but pier 3 of the four-bay arcade is original work of c.1200. The N aisle has been extended eastwards to form a chapel alongside the chancel, with a two-bay arcade between it and the chancel itself. This work is 14thc., as are the chancel and its arch and piscina. The west tower is early 14thc., to judge from the doorway and tower arch. The N nave doorway has been blocked and the S has a porch. Construction is of ashlar. Romanesque interest centres on the font; a spectacularly ugly piece, elaborately, if inaccurately carved, with similarities to the Buckinghamshire group.

Eydon was held from Hugh de Grandmesnil by another Hugh in 1086. No church was recorded.

Benefice of Woodford Halse with Eydon.

The font must be connected to the Aylesbury group, from which it copies all of its features without being an exact copy of any of them. It is certainly not the product of that highly-skilled workshop, as its inaccurate blocking out and straight-sided bowl amply demonstrate. The rogue N arcade pier and capital described above are so plain as to defy dating, but the form of the impost and an overall rough-and-ready solidity suggest to the present author a date well before the double-chamfered arcade they support, and a date towards the end of the 12thc. is tentatively offered.