Hi Bose,
I seem to remember the outfit at Fowlmere (Modern Air?) do Malibu's? Or if you really want to push the boat out, ask the Socata people at Biggin if you can check out on a TBM700/850!
Also, i know its not pressurised(or is it?) Craig Seville at Barton was talking about getting a New(ish?) Caravan on line.
What about the Bonanza at Fairoaks? Not pressurised but a fast six seater?
Here's the web site for Fowlmere!
http://home.btconnect.com/modair/html/services.html