Even my HV said there is no harm in making them up in advance as long as you use them up within 24 hrs. Its just the companies covering their backs.
Not sure about that - the staff at SCBU when babies were discharged were very clear that there is a risk in doing this. Something to do with bacteria starting to form as soon as the bottle is made and obviously the longer that happens the worse it can be. There have been some cases of gastroenteritis attributed to this.
Of course loads and loads of people choose to ignore this advice and make them up in advance and just as with everything else there is nowt wrong with that, it's all about deciding as parents what we are prepared to risk. But it is important we understand those risks first.
Most of my friends who FF, prepare bottles of boiled water and let them cool then just add the powder as needed. I think most of them give feeds at room temperature but one does give them straight from the fridge.