I watched both episodes on catch up last night, loved it all. What's all this about grim up north?! It's filmed around Yorkshire and Lancashire, our moors and hill country, stone farm houses and cottages are very similar. It can be bleak in the dark midwinter but it's glorious as well. Caroline's original and very beautiful house is in Altrincham and the private school she taught at is Bolton School, still a very popular and successful school in real life.
I enjoyed the scenes between Caroline and Gillian, the way their relationship has developed so that eventually, they offer each other some support and feel secure enough to talk about the real difficulties they're facing.
Fantastic, keep writing Sally Wainwright. Let's have more Happy Valley, or a similar series. As for criticisms of Sara Lancashire for having gained a bit of weight, I can't say I noticed. Living in this part of the world, especially in an old cottage with hopeless heating, you'd need to be well wrapped up.