The electrical current in Great Britain is 220–240 volts (in line with the rest of Europe), 50 cycles alternating current (AC); wall outlets take three-pin plugs, and shaver sockets take two round, oversize prongs. British bathrooms aren’t permitted to have 220–240 volt outlets in them. Consider making a small investment in a universal adapter, which has several types of plugs in one lightweight, compact unit. Most laptops and mobile phone chargers are dual voltage (i.e., they operate equally well on 110 and 220 volts), so require only an adapter. These days the same is true of small appliances such as hair dryers. Always check labels and manufacturer instructions. Don't use 110-volt outlets marked "For shavers only" for high-wattage appliances such as hair dryers.
Walkabout Travel Gear. Walkabout Travel Gear 888/807–4997; www.walkabouttravelgear.com.