A while ago it was noted that a car in the carpark had no tax, and two bald tyres. The hotline was called and the info given. What happened, Sorry it's on private property and we can't do it. But it will be on the queen's highway at 4pm. Still nothing. What happened to SORN then and we don't have to see it to know?
Trouble is its probably not registered to anyone & if its on Private Property different rules apply, i.e. the council have to put a sticker on it giving the owner 7 days to remove it.
Now if this is say your company's car park and they give written permission to remove untaxed vehicles on thier premises it can be treated as the road by the local authority.
The DVLA do not have the power to stop vehicles so it should be reported to the Police what time it arrives / departs the car park its a Police matter if its being driven, however it is possible that DVLA sent an Officer to the location to sight the vehicle leaving the car park so you wouldn't be aware of this and if it is SORN'd possibly the keeper has been dealt with at thier address.