One of the priests told me that this quite beautiful stained glass window was done by Tiffany. Some additional digging around on the internet confirmed that the stained glass was indeed done by Louis Comfort Tiffany’s firm and the British glaziers Bell & Almond.
Interior view. Unfortunately this exceeded the dynamic range of the camera and it was possible to properly recover the highlights which are overexposed. I include the picture anyway because it gives a fairly good sense of what the interior looked like.