I think you made the fatal mistake of giving the logbook to the Scrapman, you should have given him the, {I think it was the yellow tearoff slip} that said scrapped/exported and then sent the completed Logbook off to DVLA. I had a similar problem with an exported vehicle to Europe, sold the car at 10am and the guy drove it to the Channel Tunnel, via the QE2 bridge on the M25, he was clocked by the camera for the toll at 7pm and I got the late payment ticket, spent months back and forth with TFL and DVLA because there is no time on the transfer/logbook received by DVLA, long story short, the payment got cancelled.