Foi was 1d, and I've finished the left half (but can't parse 23a), but in the right half I have only 14d, 19a, and probably the last 4 letters of 6d, even after reading 101 forum posts! (4d and 17d still missing too, on the centre line).
One or two hints, please? How about 7d: I've already seen a mention of "original inhabitants of an Abbey or monastery" or words to that effect but can't find a way to use monk, nun, abbot prior, etc.