I am struggling here to see why the police would need pre-emptive access to medical records. I also suspect that unlike the GP data sharing where there is an endless list of local GP practices, dental surgeries and local hospitals, this will most likely be national.
It has all the feelings of some knobhead somewhere deciding that being able to add medical records into suspect profiling will add value. The fact that all this profiling appears to cost huge amounts of money yet (from what I can see) produce sod all worthwhile results.
Increasingly policing is being seen as a desk/computer based solution rather than actually have feet on the streets.