Just as it was in 1960, the supply voltage to domestic properties in the UK is still nominally 240 V AC at 50 Hz, although the declared voltage in the UK is now 230V AC +10% to -6%. Historically the domestic voltage was 240 V +/-6% (and 415V 3phase), whilst continental Europe was 220V (380V 3 phase).
Hereof, what type of adapter do I need for the UK?
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 Adapter Plug.
What is UK plug Voltage?
In England the standard voltage is 230 V and the frequency is 50 Hz. You can use your electric appliances in England, if the standard voltage in your country is in between 220 - 240 V (as is in the UK, Europe, Australia and most of Asia and Africa).