My C1 license came back dated for 3 years from the expiry date of the old license. I got the application in early enough to avoid submitting a photograph. Perhaps this makes a difference, new photo means new license date. I had thought it was the 56+ days remaining on the old license made the difference. This would fit with your 5 weeks lost (35 days) but not with the 10 weeks (70 Days) TonyEmm lost.The only thing I have since noticed is they have dated the expiry date as 3 years from when they processed it and not 3 years from the expiry date of the old licence. So I have lost nearly 5 weeks.