The main characters are
"Scrapman and Scrapcat.
Scrapman was made from scraps from the scrapyard, by Winson (Scrapman's owner).Scrapcat was made by Scrapman, from bolts, screws, a feather duster
and some wooden stool legs.Scrapman wanted Scrapcat to purr but all he could
find was a burglar alarm noise."