Just shows I've got a fair bit more reading to do - thanks

Fascinating stuff for someone who doesn't remember it to look back on mainly because it's all so different to what we have now.
This is like
The Twelve Days of Christmas - "on the somethingth day of Christmas, Control gave to me, a three-car DMU!" (that worked better in my head to be honest...)
Liking the toned-down lights. That signal's really good too - did you say you'd be replacing the pair of them at some point, or is that not as likely to be happening now?
-Peter