US Robotics SP2, UK mains to 18V AC, 500mA
No name - type 8717, UK mains to 12.8V DC, max 10W
Hewlett-Packard APS57EA-219, UK mains to 24v 0.7A DC - needs a kettle lead
Hewlett-Packard 9100-5536, UK mains to 18V DC, 730mA
OEM UK mains to 10V 1.2A
Linksys UK mains to 5V 2.5A
All of these have concentric plugs of various sizes, I'm not sure of exact sizes. I think they're all working, if anyone is actually interested in anything I'll test it.