They've tarmaced the paddock area at cadwell recently, and there's some bogs which sometimes work. Showers too, if memory serves!
No garages yet.
If there's garages at the venue, then they're always available for use, so seeing a garage full of bikes at somewhere like brands isn't exclusive to no limits. A track day is the best thing you'll have ever done henry, why not get booked up for good friday? You know it makes sense!