Hello Trevor,
Thank you so much for your speedy and informative reply.
The information regarding FindMyPast confirmed my worst fears. It is also somewhat puzzling as I physically "found" Grandfather John HALL's (2449) Attestation papers in WO97 some years ago, and before FindMyPast thought they were the best thing since sliced bread. That you were unable to find JH (929) I understand, but that JH(2449) is no longer there - strange. I have a photocopy of the former. One would have thought that if the file had been "misplaced", its existence would have been confirmed through the dilligent auspices of FindMyPast.
The information provided for JH (929) came from the PRO. I do not know the Reference source but it was a "huge ledger" in the Maps room(?) and gave information of the pension granted upon discharge, intended place of residence, actual entitlement for days served, etc. That entry is for John HALL (929) although I have no photocopy.
FindMyPast has two entries in the "free" lookup with "extra" info that may be an alternative lead. One is a John Hall born Ballinasloe c1843, and the other is a John Charles Hall who appears to have enlisted twice in the 65th. Would it be possible to have a closer look at those two to see if they might be JH(929)?
Regards
Danny