I wont fork out for usc, have done before and it was super expensive. Didnt really enjoy, but maybe if i had gone with you guys i might have.
Mph show is well priced imo, they have millions of £'s worth of cars under one roof for you to take your own photos of, sit in and stand and admire. Last year they were letting peeps drive range rovers up and down a custom built 'off road' track made with huge ramps. Think there was some kind of track thing there as well for people.
The actual show its self is extremely well put together, gold ticket gets you a seat up front and your really close to clarkson etc. And the show is hilarious. Very. Car manufacturers have their own showcases, one being the c4/2? with the robots dancing last year and that was fab!