Normally, original documents are sent back anytime after re-medical is completed up to the time for passport request.
If you need to inquire about your original documents, then you can send a case specific enquiry to London Visa office and/or contact CPC Mississauga.
Also, original documents are sent in bulk mail through TCS with the following contact person:
Mustafa YOUNUS
Manager Visatronix - KHI
+(92 300) 235 3645
___________________________
TCS Private Limited
188-189, Humaira Center Block 6,
PECHS, Karachi, Pakistan
Call: +(92-21) 3439 1551-4
Web: www.tcs.com.pk