What's your local circuit then or somewhere you'd like to try?
I've done a few "experience" type days which are always good fun, ...like driving a Formula Ford, Lotus Elise, Ferrari etc. Most circuits do those.
Or did you actually want a "track day" with an open pit lane but using one of the available cars at the circuit instead of your Zed?.
Plenty of choice here: http://www.virginexperiencedays.co.uk/silverstone?gclid=CNusus_95M0CFRDhGwodtLYKJw