Although any drama involves a suspension of disbelief, this one has too many holes to go to sea safely.
Of course Jodie Whittaker is good as the nursing sister in a failing NHS hospital whose whistle blowing costs her her job. Indeed the acting is competent all round and the settings (Edinburgh) refreshing. But ... the plot is simply unbelievable.
We are expected to think Jodie takes the identity of a doctor who has emigrated. She picks up a post at an Edinburgh A & E department. Somehow she does this with no bank account details or references. It is simply beyond credibility and the writers should be admonished for not even giving a nod to how she pulls this off. If you accept that, and her willingness to have sex in the bathroom of her consultant (a private house)on day two or three, then maybe the story line is captivating enough to see where it goes.
Luckily Jodie achieved the Dr. Who post before this medical posting unravels.