Just roll the number plate round....
... to one of the foreign ones, then do what you like. Insurance, fair enough (it's London, so best to avoid the Bugatti Veyrons of junoir Kuwait or UAE oil billionaires).
I'd be more inclined to check the brakes - they're not that good on the original DB5, certainly would be entertaining for bystanders to see it lock up in stop-start traffic when a courier cuts across a non-existant gap. Maybe a drive in nice rolling open roads on the way to the chosen port of exit would be a more relaxing choice!