The currency used for many (probably most) international transactions is the US dollar. Earlier this year, �1 would buy you nearly 2 dollars, so something priced at $30 would cost around �15. Now �1 only buys you about $1.5, so something priced at $30 will now cost around �20. Those sort of price increases will apply to all imports where the deals are done in dollars. So you can expect to see large price increases in many shops, not just electrical retailers.
Not all international trading deals are in dollars but the pound has also fallen rapidly against the Euro, the Yen and the Yuan (which are the principal alternative trading currencies) so the prices of all imported goods will rise at the point of import. Of course, many retailers may be forced to absorb some of the increases, as they compete for trade during a period of recession. Nevertheless, some retail price rises ar inevitable. Until such time as the UK adopts the Euro (which would provide a certain level of stability at times of turbulent currency trading) this country will always be exposed to the effects of rapid currency fluctuations.
Chris