For starters, eventually that information gets out

For starters, eventually that information gets out. Nothing is private anymore and there are enough people who would become whistleblowers if they thought their agency was doing something that led to more people dying. Second, do they communicate ? Quite possibly . But the UK has a very serious problem on their hands right now with cases jumping back to where they were in the springtime and Boris Johnson needing a big win to unify the UK because of Brexit. If he is the first country to use an innovative drug to halt the spread of the disease he is a national hero . He survived the disease and he brings a drug that makes them a leader in solving the virus. Do not under estimate the politics of this .Johnson will pick the drug over any push back from the US.