NICE Guidelines that you see on the NICE website are current ie up to date - the Menopause ones for example were also produced in 2015 and they will last a number of years. It takes at least two years for them to be produced. terms of reference need to be produced (not sure if this is the same for each review of guidelines?), a panel has to be appointed and then meet and review all the evidence and research, which has to be written up and the consultation process also takes a few months. Therefore the ones in 2015 are very up to date. I would suggest that if something was found that medically contradicted the advice, before Guidelines were due to be reviewed - some sort of caveat would be given at the start and ceretainly something puit on the NHS website too?
I can't imagine any doctor putting someone on statins without first suggesting a change in diet and exercise unless they were at imminent risk of having a stroke! If anyone suggested that to me I would - er - tell them politley where to put their statins. As I said earlier in this thread ( probably) the only thing I was told to do about my high cholesterol was to have it retested in two years time (I think I told the doc about my diet and lifestyle...).
Hurdity x