Informing DVLA I sold my car car tax problem - Ted
It doesn't matter. You've dated the V5C with the date of sale. Youv'e sent it off recorded.
If the car gets snapped by a camera now, it won't be down to you !
Even if the DVLA don't get the letter ( unlikely ) you just have to tell the authorities who the driver/owner was at the time. You should have that information anyway.