The eternal encyclopaedia tells me that "Hoovervilles" were not a single shanty town in New York, but formed all over the US. One of them was indeed in central park. I do like when historic DW episodes educate me about something.

This episode definitely had some promise as an exploration of class. The piecemeal offer of work for poor folk is basically what we in modern times call the "gig economy". I'd argue this part of the story is more interesting than anything involving aliens.

But then it also has daleks. And pig men. I'm really not sure why they needed the pig men. The pig men masks are pretty well done, far better than the weird human dalek thing, which just looks like a parody of doctor who rather than something scary.

Some things come to mind:

• When Doctor first sees a pigman he says can help - I'll need to wait untiI rewatch part 2, but I don't think he ever does…
• There's some nice jokes like "he's into musical theatre", which sort of makes up for annoying pining Martha.
• Despite being a theatre fan, Martha does seem to have a lot of trouble realising you can get to the other side of a stage without walking right across it