Why would you want to take the car straight back to the restrictive U.K.? Head south. Have some fun! Spain, Italy, Greece - all great! Two of us have survived for weeks on the luggage capacity of the 996.
Stick to the back roads. This will help with the break-in. Not hard to do when coming from Stuttgart.
Buy a map book. Other useful sites for travel planning:
http://www.viamichelin.comhttp://www.maporama.com/The first is well known and covers Europe. The second I just discovered and covers a lot more than Europe. A pretty good resource for all of us! I especially like that they provide lat-long coordinates.
Anyway, whatever you do, have fun with your new toy!!
Stephen