Top Gear tested Alonso's F1 car around their race track

I'm doubtful about that. If you're talking about the Enzo, it could've had an aftermarket sound system fitted into it, since after all it was the car of Pink Floyd's drummer, not a factory test car.

Neither the test with the F1 Renault nor the Ariel Atom had soundtracks accompanying them.

BTW, the latest Top Gear (Boxing Day episode) shows the Ariel Atom doing the lap in 1' 19.5, faster than the CGT and just slower than the Enzo. I want that Atom !!

 

I also want that car! So cool!