Originally Posted by killercanuck
That's a really good webpage and I don't think I can point you to anything better than that. Sheldon Brown was the absolute expert when it came to English bicycles.
I agree by the way that it should be possible to fit a Chinese motor kit to your Armstrong without doing it any permanent harm. I did consider doing this myself with a similar frame, - only as a woman who always wears long skirts I found that the motor was frightfully in the way. I'm now fitting the motor to a Mixte frame which should be a lot more successful.