Hi! I advise you to watch this thread.
www.thereminworld.com/Forums/T/31355/diy-power-supply-for-etherwave
The input voltage of the transformer depends on the local conditions, and the output = 14 volts AC, 200 mA.
European power supplies differ only in the other form of pins for the electrical outlet, as the supply voltage is also 220-230 volts. It is possible to use a simple adapter-nozzle for adaptation.
In England, go to any nearby supermarket Tesco, Asda, or any other. Adapters are also sold in boots pharmacies. Adapter from European to English socket is called "European to UK Plug Adaptor", or "Travel adapter European to UK".