SORN cars are often home scrapped. The car is only fully a scrapped when the shell is destroyed by a registered breaker and DVLA gets signed papers of destruction.
Many people buy a parts car, track car or spares car and store it for years and years. As SORN is free, they just watch the car deteriorate.
If it is SORN you may be able to enquire about keeper details from the DVLA. There is a form requesting details on the owner/keeper of a car. The DVLA decide of your request for the details is reasonable, and of course, they charge a fee for the pleasure. If they think your request and reason is reasonable you get a registered address of the car.