12V 1A/2A/3A DC UK Plug Power Supply Adaptor Transformer for LED Strips UK
£5.59
(3V, 5V, 6V, 9V, 10V, 14V, 19V, 20V devices cannot be used, the current must be less than 1A). Just buy an ac adapter and you can power most of the small 12v 1A devices. Save space and money for you.