This is a car seen in the paddock at the SeeRed meeting at Donington Park in September 2004.
It's a Ferrari 250 GTE from the early 1960s in the guise of an Italian police car. Two of these cars were apparently provided for the Rome police, one of which was involved in a crash and written-off on its first day of service and the second one is said to be in the police museum in Rome. The car pictured here doesn't seem to be the same car as the original police car shown in images I've seen on the web, so is perhaps a look-alike formed from a standard GTE (possibly 2293GT). Most of the Ferrari 250 road cars used the Columbo designed V12 3 litre engine but the 250 GTE police cars were thought to have a later 4 litre engine.