I think that the Chippy was a miniscule version of the Chipper, and had welded-on stabilizers. It was never meant to be ridden on two wheels, and was an altenative to the kids tricycle.
It was actually called a chipper not a chippy. Have a look. I had a chopper and my bro had a chipper then a tomohawk.
http://www.rcoc.co.uk/CHIPPERPIC1.htm
Do You Remember Raleigh Chippy?
Do You Remember Raleigh Chippy?