I bought all the episodes on DVD direct from Tim Hunkin. You can get his email address from here.
We exchanged quite a few emails at the time and he really is a top bloke.
Here's the info I got from him...
"I couldn’t persuade anyone to produce commercial DVDs of the series so
I’ve mastered my own set. They work fine, but are mastered from PAL VHS
tapes so the image quality is not quite as sharp as DVD movies. I’ve
made 3 disks, each one containing a complete 6 part series, in both PAL
and NTSC.
For people who originally saw the films on satellite channels, there’s
additional material, as the satellite versions were cut to leave more
time for the adverts!
I’m afraid they are not cheap, they are only licensed in limited numbers
for ‘educational’ use – I don’t have the rights to produce commercial
quantities!
SECRET LIFE OF MACHINES 1
Vacuum Cleaner, Washing machine, Sewing Machine, Refrigerator,
Central Heating System, Television set
SECRET LIFE OF MACHINES 2
The Car, Internal combustion Engine, Quartz Watch, Radio, Telephone,
Video Recorder
SECRET LIFE OF MACHINES 3
Fax Machine, Lift (elevator), Word Processor, Electric Light,
Photocopier, Office
TECHNICAL SPECIFICATION:
The PAL version disks will play on PC and MAC computers in any country
and set top DVD players in Europe and all other PAL and SECAM countries.
The NTSC disks are slightly lower quality (720 by 480 pixels instead of
720 by 576), but will play on US set top DVD players (and computers).
A few earlier set top DVD players (over a couple of years old) won’t
play DVD+R disks! I will refund your cash if the disks don’t run on your
player.
Each disk contains 160 minutes of video, recorded in DVD+R, on a Pioneer
burner, transcoded at 3000kps VBR from a VHS source, in multi-region
format."
Dan