I love the show! I couldn't give a t-ss about the Corbyn impersonation. The Corbyn cult are insane. If you've seen Saturday Night Live in America, they hardly ever sound like the real person. Ullman is not an impressionist, even though the Beeb likes to dub her one. In fact, she went out of her way and avoided impressions. She was all about original characters. It wasn't until the late 2000s that she started doing them because comedians that do sketch shows were expected to do them. Her Renee Zellweger and Arianna Huffington are legendary. She recently said that she more so interprets them and takes on their essence and I happen to agree. I wouldn't want to see a straight up impersonation of someone. I enjoy comedians who take a part of a real person's personality or voice or mannerism and magnify it (Theresa May always sounding hysterical).
Ullman said that even she has her limitations due to gender. For a satirical show though, it shouldn't make a difference. The message is what's important. The majority of the people on shows like Dead Ringers don't sound nor even look like the real person. Tracey studies people to a scary degree, even their posture and stance.
Bottom line, "Tracey Breaks the News" is funny and packs a punch. I wasn't a big fan of the previous show "Tracey Ullman's Show". Some bits were great but others fell flat. I'm familiar with her American work (the 80s Tracey Ullman Show and HBO's Tracey Takes On). I know what she's capable of. I would watch a spin-off show of Ullman's Camilla Parker Bowles any day, even Judi Dench or Maggie Smith... even Theresa and Philip. I love seeing her characters doing everyday mundane things.