They're at it again. This one seems like another care.data only possibly worse.
For those who would like to opt out, see here:
https://medconfidential.org/how-to-opt-out/
Note that if you haven't previously opted out from similar plans for data sharing, you'll probably need to opt out of two separate systems this time, one for sharing your GP records and one for sharing records from other sources like hospitals.
The deadline for notifying your GP surgery to avoid data starting to leak appears to be 23 June.
Also note that in some situations, for example if you want to opt young children or vulnerable adults you care for out of these systems as well, you may be in print-and-post territory even if you could opt yourself out using an online system.