@ K re partner visa.
My situation is very similar to yours, I'm Aussie been living in London 12 years and my wife is polish. We have been together 10 years have a 3 year old daughter and our second is due in 4 weeks. I used a migration agent so I just emailed her my questions and she always replied within 24hrs. I have submitted my application without the xray and Medicals and have included a note to say we will have them done after my wife gives birth. I personally wouldn't risk any X-rays if your pregnant especially if your in the first trimester.
I included banks statements, bills, leases, council tax bills, letters, travel itineraries etc as evidence of our relationship. But I didn't submit any photos thinking why with all the evidence we have. Our agent came back to me and said it was necessary so at her request we emailed her 10 photos some of us as a couple and some including our daughter.
As for finances Im self employed so I just had my accountant write a letter covering the last 2 years earnings.
I imagine it would be more of a problem if your husband wasn't living with you!
My only concern for me is the forms changed on the 1st July and our probably won't arrive at AHC London until Monday!
Best of Luck
Shane