Unfortunately, if you have the clout and money and a facile excuse, you can also get data on patients straight from the NHS itself.

'Revealed: Google AI has access to huge haul of NHS patient data' - https://www.newscientist.com/article/2086454-revealed-google...

'Data deadlines loom large for the NHS' - https://www.bmj.com/content/360/bmj.k1215