Government Ministers and possible conflicts of interest

There is a pretence that when UK government ministers put their financial investments into a blind trust this frees them from conflicts of interest in the decisions they make as ministers. (See Guardian report and the Comments beneath the report.) People who believe this nonsense, I suspect, spend quite a lot of their time away with the fairies... No doubt they also believe those members of the medical profession who claim that their financial ties to the pharmaceutical industry in no way influence their decisions about which drugs to prescribe/recommend?