BBD, Seaside and Somewhere - I have a similar problem with weaning DD off BF. Was going to do it when she turned 1, but we've got nowhere! It's something I definitely have to do soon for medical reasons but it's so bloody hard as it will be rocking the boat in our daily routine. DD expects boobs when she wakes up, and also when we get home from work/nursery (this is the most critical feed of the day and will be the hardest to cut out). The nighttime one used to be important too as she would feed to sleep but usually find now that even if I put her down asleep, 30 seconds later she has risen like a zombie to to hang over the side of the cot and laugh, throw her toys around etc.
Replacement milk was a bit of a problem as she never took to formula or cow's milk so just has water during the day. She might be a bit more up for it now though as not nearly as tricky to get liquids down her. It's so hard giving up altogether though isn't it!
DD is thankfully loads better now after bug and eating normally. She's been hilarious this evening - fed me raisins while we were sat in the kitchen just before bedtime (hmm i think she knew I was supposed to be fasting). Then once upstairs on the changing table she did her usual nonsense of leaping into crawling position while I was trying to change her nappy. Before I could get a clean nappy on, she'd done a big wee on the mat and then proceeded to dance/roll in it and was covered from head to foot so ended up having a last minute bath.
Somewhere sorry you lost your FB message re fasting - would love to have seen it! I think I've been doing pretty much as per your advice - in the morning I have tea, coffee, water and miso soup, then for lunch I have a litre of lentil and tomato soup (spread out over two servings). Then more drinks in the afternoon, then stir fry veg with a quorn burger and a little bit of melted goat's cheese for dinner, and think that all comes in at around 600 calories. Will have to vary the menu a bit soon, but so far that's worked pretty well. The 5:2 thread has been really useful and have posted on there fairly frequently. Interesting what you said about your thought processes while fasting - I was worried I would be too light-headed to work properly but in fact the opposite has happened and I've been really productive (almost as if my IQ has gone up a few points)
Scarecrow well done on getting through your first 'productive' day - I'm sure there were no typos 
How are you managing energy-wise with your new routine?
Knotty your charity walk sounds fab - 20 miles is pretty epic! I'm not sure what the longest distance I've done is, but think it was about 15 miles. The main discomforts I remember were massive blisters on my little toes plus a little bit of hip pain I think (felt it there more than my leg muscles). It was in fairly intense humidity (jungle climate) so that may have contributed to the blisters but probably best to have some well-worn shoes to walk in! I'm not sure how much you would need to train as I think these types of things tend to be as much a mental feat as a physical one (and think you are fairly fit anyway?) I think if you can manage a 10-miler ok, then you will be able to dig deep on the day and to twice that!
Seaside plastic food is awesome isn't it! DD got some last year from a Japanese friend and it's got some brilliantly bizarre items such as a piece of scampi that can be cut in half then put back together again as it's velcro backed! Do you have to play pretend eating with DD?
Rosie first letter is the hardest - the next one will be a doddle in comparison!