Like the F1, Murray wants a car that is "compact, lightweight, and powered by a high-output" engine. Unlike the F1, Murray wants that engine to be "small capacity," and a 6.1-liter V12 probably doesn't fit that bill.
It's hard to imagine the dinkiness that will be the Type 25 doing double duty as a supercar -- after all, we already have the Brabus Smart for that. But if you add up Gordon Murray; a small-capacity, high-output engine, a compact, lightweight; rigid body structure that will probably employ a fair bit of Caparo's carbon fiber expertise, what do you end up with? Not the McLaren F1... but an F1 car. For the street. And you really can't get enough of those, can you?