yeah things have changed a bit in the last 10 years to try and combat scrap theaft.
So scrapping a car without a V5 being handed over is ODD now to the metal merchants.
Probably requires a decent conversation with the office manager, statements on record and photographic evidence. This is all to protect them from prosecution.
The merchants should be receptive though as they are recyclers and car lovers at heart so should understand the situation that a drive train is being saved.