On the north side is a blocked C14 nave doorway that retains its original arch and hood mould, two 2-light square-headed nave windows, one beneath the eaves, and two 2-light chancel windows.
The floor is stone-paved, with encaustic chancel tiles.
PRINCIPAL FIXTURES: The C19 Perpendicular-style font has a prominent crocketed ogee-domed cover.
There are also 2 C19 memorial tablets.
Fragments of medieval and later stained glass are in east and south windows.
New seats, pulpit and reading desk were installed in 1883, but have since been removed.
REASONS FOR DESIGNATION: The church of St Thomas, Willesley Wood Side, is designated at Grade II for the following principal reasons: * It is a small C14-C16 church with mid C19 tower and general remodelling in a Gothick Revival style, the whole having the character of a country house estate church
* Retention of some C19 interior fixtures and fittings, including font, text boards and tomb, and some fragments of medieval glass.