Lit. Lesbian Gay Bisexual Transgenderist Liaison Officer (LGBTLO).
A position in many of the police forces in the UK to build bridges with the LGBT community, facilitating 3rd party reporting of hate crime (i.e you dont need to go to the police personally)among other things.
LGBT LO's also build relationships with any LGBT venues in their area
Officer: Yeah I better call that club that had a homophobic incident last week.
Officer 2: Oh yeah, you're an LGBTLO I remember now.