As well as bp for bishop in 1a, what held me up for a long time was the word "veg" instead of vegetable. I thought there must be some significance in that. I'm not saying it was unfair but it was an unnecessary spanner in the works and silly me for thinking clues were tightly constructed.
I'm about to give up, unless some kind person is willing to disclose which entries leave empty cells and/or which clues which four across and down clues have a cardinal point missing.