To me, a lot depends on how Theresa discovers she feels about giving up teaching for her new life. I think that she and Nick get on and even care for each other, and if they weren't in a TV drama, could realistically make quite a happy life, depending too on how much more the war hits him, if they moved and if they had children. But his feelings for Sarah and Theresa attraction to women, if they act on them, as they more than likely will if there's a next series, will probably damage the marriage. Although I could see the show having him realise he'd been impetuous and worrying he'd hurt Theresa and then finding out about the lesbianism and putting a probably anachronistic spin on it, too.

we don't know for sure who was actually killed in the crash, unless I missed something (the ending I saw was when the rest of the town began to approach the wreckage and the house).

This is true. All we could take in was some level of destruction and that the baby'd survived.

I haven't heard that it's been picked up for a third series, but I haven't heard that it's been cancelled either. It's been against stiff competition in this slot, and I don't know if a real hit just before it has helped its chances or not. I'm presuming it will come back until informed otherwise.

They had to do something else with Joyce if they were bringing her back, and showing a nicer side and delving deeper into her family life worked.

(But what if everyone except the baby had died, wouldn't that bring Laura and David together? Although it would be ridiculously OTT.)

It does seem strange when public opinion is a recurring theme in the show that all we got was a noted lack of reaction to Pat and Bob's argument.

I do think that Bob's book is about a couple where the wife is having an affair with a soldier.

It would be fun if Bob thought the cuckolded husband was the hero of his novel, but because it's so lifelike, the editor is sympathetic to the wife.