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More detailed info from the TG homepage:

Strap yourselves in ladies and gentlemen, because this week's Top Gear is even more power-crazed than usual. Jeremy goes seriously schnell as he takes the latest 720bhp creation, from mentalist German manufacturer Brabus for a spin on the test track. We give Porsche's latest 911 Turbo flagship a full shake down, and see whether the everyday supercar has become a bit, well, everyday. And Richard and James embark on Top Gear's biggest ever challenge, as they try to turn a Reliant Robin into a space shuttle. Trust us, you really, really don't want to miss this. Plus comedy actor Simon Pegg will be joining us in the studio and doing his bit on the test track in our reasonably priced car.