Given the drug has been used for almost 40 years. Lack of evidence it is safe. Is just a political way of saying we have no evidence it is dangerous.
After 40 years of clinical use. With many patients benifiting from its application. And the medications passing the medical trials standards of the 1980s. Pretty much any other medication the NHS has banned or restricted use of. Was because of new evidence. Not the lack of it. I say pretty much. Because cost and politics has been used in the past. The NHS was just more open about the reasons.
Restricting a long used medicine with a lack of evidence. Is a political not a scientific choice.