UK plugs, also used in Ireland, are large and have three, substantial, flat prongs. They are unlike plugs used anywhere else in Europe. If you use dual voltage appliances and devices, all you will need, throughout the UK, is a simple UK Adaptor Plug Buy direct.
One feature of UK outlets worth noting is that they can be switched on and off at the wall. The "power point" on the left in the two point wall socket (bottom picture, above) is turned on, the one on the right is in the off position.
If your device doesn't work, make sure the power is turned on at the wall socket.