European Union (Withdrawal) Bill

I am increasingly puzzled by this conversation. If you are doing a clinical trial, you have to harmonise all the arms of that trial for it to be randomly and properly assessed and for its statistics to be valid. Is the noble Baroness suggesting that we do our own small trials, irrespective of what is going on in a much larger pool of people? Does she not understand that, given the genetic diversity of the European population, the more people who are involved in the same trial, the more relevant the answers to the trial are, particularly in cases such as cancer, where they are all under the same rules?