Just finished, but I can't parse my last two:
5d Business incurs penalty (restricting legislation) (8)
I have Practice as the answer, but only because it fits my crossers - no idea about the parsing.
16d Very quarrelsome whip, Dan upset Harry (3-3-3)
Cat and dog seems to be the only possible answer, but apart from the middle word being an anagram of Dan, I can't see the rest of it. What has Harry got to do with anything?