Haven't managed to catch up much, I'm really rubbish at staying up to date!
book hope your mum's doing ok :)
Our HV hasn't mentioned vitamins, but we signed up to the NHS email thing, and at 6 months they sent one saying that they recommend vitamins for breastfed babies, but if they're getting a certain amount of formula (might have been 300ml) each day then they'll get all their vitamins from that.
I've spoken to a couple of people about cows milk. Opinions seem to range from it's fine, to no humans should drink it at all 
I think vitamins (especially vit D which is really hard to get from food, apparently 50% of adults in the UK are deficient in it) are the main concern. So either cows milk and vitamins, or formula. We're using formula as I can never remember to give the vitamin drops!
L has two bottles a day, then a breastfeed in the morning and evening (and sometimes through the night!). Not sure when I'm going to stop BF altogether.
Haven't heard anything about the MMR either, going down to Devon for L's birthday and my uncle's funeral, so I'll chase it up when we get back. How did you all arrange it?