Thanks all:
ILostIt I'm really not a fan of Spanx. I'm sure they do the job, but they also give me chronic tummy ache, so will be steering clear.
MrsLettuce Height of the shoes isn't the biggest concern (though I am so uncoordinated that I do struggle with anything over 3 inches). It's more the size of the toe box. I have really narrow feet, but anything that squeezes my toes causes a lot of pain. I can't buy wide-fitting shoes, because they come off the ankle. Think of my foot like a duck's feet. Lucky me.
I did get steroid injections for the neuroma (made no difference). Even my private health insurance doesn't cover the freezing option (I would pay for it if they could guarantee it would work - but they won't). My final option is surgery, but with a toddler and a baby, I can't be off my feet for the required recovery. Maybe down the line!
Peachy Yes, I love the Lindybop dresses - they are really well cut and (I think) good value for the money. I have returned one (once) because the material looked cheap, but I generally love their range. I'm not quite as heavy up top (32DD, or possibly 34 since having the most recent sprog... haven't worked my way up to getting remeasured yet!)
Puffins I hopefully won't need to breastfeed whilst wearing the dress, as the baby isn't coming to the wedding. Worst case, I might need to go somewhere quiet and pump for a bit! I'm not too worried about that aspect of the dress - so long as it has a bit of give in the bust as my boobs get progressively larger during the day!
Diddly Thank you so much for the shoes - of all the styles you picked, this was my favourite - but unfortunately I can't wear mules as they fall off the back of my feet. I do like a cream / nude sandal for a summer event. Do they make a suitable Croc or Ugg? (Joke)
Thanks to all those who say they like the existing dress. I do too! But I think I will take the consensus view that it might not be the best choice for a summer church wedding... especially as I'm a known vociferous atheist - I'd hate people to think I was trying to make some sort of point!