Re: There is a venerable tradition here
"Used to test drive these (Scorpions) and once overtook a porsche on a dual carriageway."
You disabled the governor, didn't you?
When the carrier of one of them broke down on the way to an exhibition in Belgium, the crew just dismounted it, took off the governor and proceeded to the exhibition. They were stopped by the police, of course, showed the insurance and licence for road use, and merrily continued on their way at 74mph.
Apparently nobody tried to stop them when they wanted to move out into the overtaking lane.