When troubled and abused inmate Davis suffers some severe nightmares and rings for Greaves, he is completely oblivious to his obvious mental state and labels Davis a time waster. When Davis rings his bell a second time (after cutting his wrists), Greaves simply looks up to the alarm system to see who is ringing in his office and, when he sees that it is Davis' bell again, just goes back to reading his newspaper.
In many ways, Greaves represents the overall apathy and unhelpfulness of the system.
"Cut that out Davis, or I'll give you something to cry about, ya mardy-arse little toerag! You ring that bell for no f***ing reason again, and I'll 'ave you down the block before yer feet touch the ground! Now get yer sub-normal head DOWN!"
In the BBC screenplay, Greaves is portrayed by Stewart Harwood.
Harwood's Greaves is more thuggish than Philip Jackson's surly and miserable portrayal.