Soldato
I wouldn't be too worried about being caught by Police, but I'd be very, very worried about potentially running up the back of old mate in his Flying Spur by accident. What then?
They'll pay for the damage you caused as you're fully insured regardless of tax and MOT, only caveat is your insurance will only pay the value of a non-MOT'd example of your car, hardly a worry with a car like this.