Effects of health information technology on patient outcomes: a systematic review
----- End Abstract.
Here is the link
If you have access this link gets you to the full paper as well
Given that the PCEHR does not have any decision support and is not an inpatient system it looks like there is precious little evidence it is likely to work!
The Government has no idea what it is doing in e-health - other than relying on a 'wish and a prayer'! $1.5B is a lot to pay on trust.