The electrical voltage in the UK is officially 230 volts plus or minus 10%. Electricity in UK is generally supplied at 220 volts and a frequency of 50Hz. Any device rated between 200volts and 250 volts works well. A frequency of 50Hz is the standard frequency regardless of the voltage.
1 Additional Answer
An electrical signal is a voltage or current which conveys information. The electrical voltage in the uk is 230V. It used to be 240 and the continental 220, but both were changed to 230. So there should be no problems with any devices.