Where's the line between acting aggressively for a client and venturing into unethical behaviour? Is there even a line?

Following news about lawyers' roles in the Post Office scandal, a lawyer being referred to the U.K.'s Solicitors Disciplinary Tribunal for controversial libel letters and an investigation into law firms' roles in defending companies from child labour claims, Law.com International editor-in-chief Paul Hodkinson debates the issue in this video.