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Based on my consultant/lawyer's many other London cases, he says London CHC issues PPR request between 1 - 3 months after medical receipt.

In my own experience, mine took about 2 months after medical to come, but that was way back in 2007!....I suggest you follow up with them if its been more than 3 months, since it says on the back of the medical form that this is the expected time.
 
Hi
This is 7 months that London CHC reveived our medical results.
No PPR untill now !!!! :(