As almost every week, 30 minutes searching dictionaries and thinking about the very one or two, in this case two, viz: 27a. Fertilizer plants appearing in a number of TV shows about hydrogen (8). I...
Stuck as usual on the very last one - probably also as usual blindingly obvious. 29a. One rode around with palms being laid down (4). ITA- (pretty certain about those letter, but you never know ...).