More progress! The hem is done, I've added in the skirt lining, a waistband facing and a zip guard. I've ordered some boning to add to the centre back which should hopefully sort out my back fit issue, and I've cut my train.
I feel like I'm on the home straight now, but I'm about to slow down again, as the lace trim needs hand sewing to the train (currently pinned). I'm hoping it will be a bit easier than the bodice as it is pretty flat, and hopefully only needs attaching at the top edge.
I originally planned a 30cm 'chapel' train, but when I came to cut it, I decided it should be longer, and went for 55cm, which is more 'cathedral'. I immediately wished I had cut it even longer, so I had to give myself a stern talking to: "Charlotte, you are having a civil ceremony in a barn in Surrey, not a royal wedding in Westminster Abbey..."
I've ordered three more pairs of the lace appliques to add to the bottom of the train, which will make it easy for my bridesmaids to see the centre back when they are arranging it for me. Luckily the fabric for my mum's dress is coming from the same place, so I was able to order it together and only pay once for shipping.