OK got a bit more time to post now.
splatt your BF story is very similar to mine. You might like to read of others who wanted to BF but who had to move over to FF here.
Responding to your OP
"The carton says boil kettle, wait 30 mins, make feed, cool and give immediately. So how do you go out for the day? And in the night what do you do with screaming baby while you wait half an hour for the water to cool to 70 degrees."
The information on the packaging is sadly crap.
.
The reason for the boil the kettle and wait 30 minutes is so that you are using water which is 70 degrees.
Of course you have to cool the bottle and test the temperature on your arm before feeding
This is the World Health Organisation guidelines which have been adopted in the UK.
Formula powder is not sterile and has been shown to contain nasty bacteria which can cause severe and fatal illness.
Of course this is rare, however the risk is higher for younger babies and especially prem and immune compromised babies.
Experiments have shown that water which is 70 degrees will kill bacteria but won't destroy nutrients in the milk.
Please note that you should not use boiling water or water which is hotter than 70 degrees.
In order to get water which is 70 degrees (if you have no thermometer) then 1 litre of water boiled and cooled for 30 mins in a normal kettle will be just over 70 degrees.
Of course you cannot predict accurately when your baby needs a feed.
So the first thing to note is that a feed should be used within 2 hours - so there is a little lee way to start with.
Alternatives for out and about and night time are cartons or flasks of milk or - making in advance.
Yes part of the guidelines show how to safely make in advance. This is much much safer than making with cool water.
Seethis leaflet which I linked to above.
Please can you consider taking this up with your HV - I am afraid she is giving out dreadful advice.
The guidelines are not "in constant flux" they have been the same now for about 4 years.
NikkiTwinkle - you didn't follow the guidelines - I am never sure why people who did not follow the guidelines post on these thread and do not disclose this fact? (unless you don't realise what the guidelines are?)
babyrose and others who are not sure - pleae please read the leaflets I linked to in my first post. Reading this thread is no substitute for carefully reading all the guidelines and all the alternatives. 
splatt - I would like to take exception to
"So many different ideas, and I bet none of your babys have suffered!"
These risks are low but very very serious - therefore we are statistically unlikely to have someone here on this thread/section/MN whose baby has had a problem.
Are you aware that FF babies have far higher instances of D&V? Have a look at this current MN thread about salmonella in babies.