Greetings, I'm James from Practical Devices Corporation, makers of good headphone amplifiers. We're glad to be aboard The Art of Sound. We are based in Canada, and ship worldwide, including the UK.
If you have a pair of higher-impedence headphones that are begging you for an amp, please give our products a look-see. Our equipment offers strong clean sound, and is packed full of features which are simply not available elsewhere. Further, the pricing won't lead you to bankruptcy or shortness of marriage.
Our website is http://www.practicaldevices.com
For some humour, we were sent this picture, of an XM4 amplifier underneath a car. The amp survived no problem, save for a few scratches from the pavement. Although our products are tough, we ask customers to refrain from this.