I've finished but I wonder whether there is a mistake in the clue for 6d. I think sex should become six (so that VI goes). So I is the correct letter but it needs to be E. And shouldn't it be forgoing and not foregoing?
I see Chambers does give forego as a possible variant of forgo, but Fowler's Modern English says that it is "ill advised". I think it is nice to keep the distinction. Chambers can be a bit free and easy with words. For example, it allows wintery (which other dictionaries don't) instead of wintry.