diff --git a/docs/iris/src/whatsnew/latest.rst b/docs/iris/src/whatsnew/latest.rst
index e9fb007aca..44f5431422 100644
--- a/docs/iris/src/whatsnew/latest.rst
+++ b/docs/iris/src/whatsnew/latest.rst
@@ -54,7 +54,8 @@ This document explains the changes made to Iris for this release
 💼 Internal
 ===========
 
-* N/A
+* `@rcomer`_ removed an old unused test file. (:pull:`3913`)
+
 
 .. _@gcaria: https://github.com/gcaria
 .. _@rcomer: https://github.com/rcomer
diff --git a/lib/iris/tests/stock_mdi_arrays.npz b/lib/iris/tests/stock_mdi_arrays.npz
deleted file mode 100644
index 668c6d8473..0000000000
Binary files a/lib/iris/tests/stock_mdi_arrays.npz and /dev/null differ