Kiwi, I am just super bitter at the moment but I would say for us the major problem has been what if one person is happy to stay but the other decides after a while that they want to go back? I think somewhere like St A is a good thing as you will both still be commuting to London so won't miss your London working life and will still be able to go out in London and see friends after work and still get home at a respectable time. Anyway, I suspect your DH is a reasonable bloke whereas mine is a complete arse so there are many differences.
To answer your q properly, the pros are very much the bigger living space, things like public transport being easier and the ability to get from one side of town to the other in relatively little time. Cons: the biggest wrench is having friends you can just pop round and see spontaneously, the feeling of starting again, and the fact that you will be more dependent on each other as a couple. But I think the fact you both work in London makes a huge difference, and the fact you have PILs nearby will be a huge boon with a DC2. If you're both up for it, I'd go for it.
Sorry, am in a foul mood tonight, am babysitting at a friend's house after storming out when P and I had another argument. Everything is so sodding near the surface for him at the moment. Because I was going out this eve he went out for his evening walk before putting T to bed, and he normally has a pint and a fag in the pub on his walk. (which is normally after T goes to bed).
I made the (I thought entirely reasonable point) that it would have been better had he waited to have the fag until after T had gone to bed as he would be cuddling and kissing him and giving him his milk and I didn't particularly want T smelling of smoke.
P goes ballistic, says I'm taking away his one pleasure in life as he has so few (boo hoo, I'm not saying don't smoke, I'm just saying do it after T is in bed), and that while we're on the subject of potentially damaging our children, I raised my voice at T when he was throwing his dinner everywhere after a v trying afternoon. I know I'm not perfect and would never claim to be but surely these two things aren't comparable. I realise I caught him on the defensive but honestly, I'm so fed up of every comment starting World War 3.
Part of me would love to run a mile as I just feel we are the world's most incompatible couple at the moment and everything becomes a fight. We are so different and I hate to think what the atmosphere must be doing to T (and to DC2). That's also the worry, the fact that I'm pregnant is really worrying me, I don't want to stay in a relationship that isn't working just because I'm pregnant, but the idea of going it alone right now scares the living daylights out of me. I wish someone could come along and tell me what to do because I just feel unhappy most of the time.
Sorry for such a self-indulgent post, I just had to get it out of my system. Veggie, I really feel for your poor DS1, I hope the Daktarin will have an effect soon and so glad you've seen a more sympathetic GP. Thanks too for the London Bridge advice!
Oh and big hugs to Trace too.