The very senior Labour figure from the 1980s who Blair called a "c word"?

Paul Linford speculates as to which "very senior Labour figure from the 1980s" it was, according to Andrew Rawnsley's write-up of Alastair Campbell's new book, Blair called a "c-word".

When I read Rawnsley's article yesterday I thought it sounded like Roy Hattersley. Paul Linford confirms Hattersley as the odds-on favourite.