Conversation so far:
Why did Peter Sutcliffe criticize the Yorkshire police?
West Yorkshire Police were criticised for being inadequately prepared for an investigation on this scale.
What was the investigation?
It was one of the largest investigations by a British police force and predated the use of computers.
Information on suspects was stored on handwritten index cards.
Did anyone represent him?
CANNOTANSWER.

Question: What did he do?
Self-contained rewrite: What did Peter Sutcliffe do?