Went a couple of years ago, there were a lot more vehicles than you described above. Lots of FIAT 500's though. A few Ducati's and Moto Guzzi's overrun with Lambrettas and Vespas along one of the side streets.
Bridgnorth is normally well attended, less bike and more car oriented but usually enough exotic cars to make the ride out and £5 to display worth it.