Thank you Girl Guide, going through each of your thoughts -
What source and date are you using for the William McPhee you spotted in London?
Will investigate the 1921 references.
I’d assumed he would have been Presbyterian from details of other family so think the Fr McPhee you kindly found is unlikely to be him but will rule nothing out at this stage pending further evidence.
Thank you Rosie,
This is definitely the same person, unfortunately I don’t subscribe to Ancestry so unable to follow this up, grateful for any further information which might be available from this source.