Clearly in need of something to do - I bought one of those power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob