I think! I was haeding south on the A12 from Ipswich yesterday & saw the unmistakeable shape of a DB7 Zagato grille heading north. It was a convertible though...
I think that means it has to be an AR1, which I thought were US only.
Someone very brave, as I don't think the car comes with any sort of roof (correct me if I'm wrong). Not great in this country.
James Caan is often seen in a AR1 in the Sky TV programme Las Vegas. And one appeared in The OC (driven by that bloke Jim that used to be in Neighbours )