I'm talking about his mother, not his wife.
Do you know where Marie Catherine (nee Ollivier) was buried/cremated? I can't find her death records. I thought 'Mrs. H. L. Short of St Mabyn' is referring to Mrs. Horace Leonard Short? It could be just a coincidence though, lots of Shorts in Cornwall, or more likely a transcription error (I don't have a subscription to check the actual article).