puzzledpom
Those were among my last ones in and it took ages for me to see.
19 - you really need to think laterally on this one. The previous hints are accurate but also serve to reinforce Qaos's brilliant misdirection. Once you see it, it falls neatly into place.
29 - the wordplay is actually very straightforward but the solution is pretty obscure and certainly not in most dictionaries or even Google. This threw me until I looked in Chambers - the only place I've actually found it. If you think you have an answer from the wordplay, but can't confirm it with a dictionary, try "the consistent formula" on it and see what happens.