File the widened ‘polarization tip’ off the one prong of the plug so it’ll plug into the 220 V. British (round prong) tip adaptor. Use the brown extension cord not only to bring the electric closer to you (in rooms that only have 1 plug for the whole room), but also to multiply the plug so you can charge your a) laptop, b) PDA, c) digital camera all from the same cord. Many rooms will have only one plug. You won’t want to have to decide which unit to charge. If you’re lucky enough to be able to charge all your devices through USB ports (reducing the number of AC outlets you need), you’ll still be glad you have it for the times there are multiple group members who need power. USB-type charging is a great feature, whenever you can use it. Just get all this stuff sorted out BEFORE you depart so you can utilize your trip-time for people instead of devices.