I'm getting loads of helpful suggestions. The real complication is that my original transcription was IBDAPO, whereas the latest transcription is IDBAPO and, being in Australia, with the letter in England, I can't easily check which Harry actually wrote. Apologies.
"Army Post Office" seems pretty cut and dried. It could be 33rd Infantry Division British APO or 33rd Brigade D APO wher the "D" stands for "Distribution", "Dispersal" or something else.
Both the 33rd Brigade and 33rd Division were there in Flanders (May 1917) but neither seem to have had the West Yorks as members at that time.
We'd better leave this investigation on hold until I can check the original.
His full address was "Pt Lamin West York Reg number lines 33rd IDBAPO section 17 BEF France" - temporarily in the West Yorks before joining the York & Lancaster Regiment. email
Thanks to David, Marcy, Michelle, Marilyn, Mari, Robert,Gy and to anyone else who has made suggestions or researched the topic. We have a wonderful community out there.
While Harry is home on leave, it would seem a good opportunity to publish a card that Harry sent to Jack last November. I simply missed it as it wasn't kept with the letters, organised in date order. My apologies.
Harry is on leave. We must remain aware that many soldiers found their time on leave extremely trying. They were in an environment where no one could have the slightest understanding of the horrific world they had left behind. Many were relieved when the leave ended and they could return to their comrades who could understand. BL
Posted by Pte Harry Lamin at 5:03 am