I'll go but then I'm local, I think a Sunday would be good as its city centre and would be quieter.
This is a really good museum, it has all sorts of cars like ,DeLorean, Tyrell 6 wheel GP car, Thrust II and Thrust SSC and with free admission must be Hoodie heaven.
PS theres a Dortor Who exhibition on at the moment but this isnt free.
Jez