I'd argue that the French police simply don't need fast traffic cars for pursuits. Why would they? In the event they are called on to chase some miscreant on the motorway, I imagine they just send a few local beat cars to the local toll exit points and wait. Or, if its a regular 'speeder', they simply time people between toll plazas and wait until they're stopped at the barrier to pay.
Very efficient it is too. I saw it coming back from Le Mans a few years ago, two TVR's and an F40 screwing it down North of Rouen, the police simply throttled traffic flow at the next toll plaza and sat the other side of it, fining them and anyone else, with toll tickets where the times were impossibly short between barriers.
In the UK, our infrastructure just doesn't support that kind of tactic (for obvious reasons) - so we'll always need something with a bit of get-up and go.