I telephoned the DVLA to clear this up. A new law has just been passed through parliament that has not yet been activated. However, I was advised that persons should act on it anyway to avoid being caught out.
If your vehicle is on private property and taxed it must now also be insured. Previously you could have a taxed car on your property without it getting sorned.
Now, if it is taxed you must return the tax disc for refund and SORN your vehicle until you wish to re-insure it.
Another quote
"Under a new law set to come into effect from 20 June, it will be an offence to keep an uninsured vehicle, rather than just to drive when uninsured.
The new system, called Continuous Insurance Enforcement (CIE), will compare the DVLA registered keepers database with the Motor Insurance Database (MID) and contact uninsured drivers so that they obtain insurance by an escalating system of penalties.
Those caught will face a penalty of £100 – which can be reduced to £50 by early repayment but will only target drivers who have obeyed laws by registering their vehicles with the DVLA. Only vehicles with a valid Statutory Off Road Notice (SORN) will not be required to be insured. "
Another
"CONTINUOUS INSURANCE ENFORCEMENT: WHAT IT MEANS FOR YOU
If your name is on the V5 registration document, YOU must arrange insurance for the vehicle in question, unless you have declared it SORN.
This is the case even if you do not use the vehicle. If you have a classic car tucked away in your garage, that is only insured and used for a few months in the summer, you still have to insure it all year round.
If you do not take out insurance for cars you have not declared SORN, you face prosecution and risk losing your car.
In the first instance, an Insurance Advisory Letter (IAL) will be issued, informing you there’s a risk of prosecution if you do not take out insurance.
Ignore this, and a £100 Fixed Penalty will be issued. If you still take no action, there is the risk of your car being clamped, so you cannot use it. Or, worse still, it could be sized and crushed.
The most serious penalty is court prosecution. Here, people who still refuse to take out insurance risk a court appearance and a fine of up to £1,000.
Registered keepers thus have two courses of action: either take out insurance, or declare a vehicle SORN."
Lastly GOV site
http://www.direct.gov.uk/en/Motoring/OwningAVehicle/Motorinsurance/DG_186696
So there you have it, your right and wrong.
A SORN will allow the vehicle to be kept off road uninsured.
So now you can keep the traffic jam creator.
Dont forget the thank you button.