Picture the scene... 2:30am at an unapproved speed on an empty motorway and the handling goes a bit wonky on the car just as I'm pulling off onto a sliproad... all of a sudden *badonkbadonkbadonkbadonkbadonkbadonkbadonk* Hazards on, pull over and get out... horrible burning rubber smell - I wasn't going THAT fast!! Press the tyres with my foot... nearside rear is flat :-| Long story short... I changed my first tyre!! Impressed with the Mercedes boot kit and found I had everything I needed to get the space saver on there and inflated without too much effort and swearing!!