Enemy is sweeter than Liberal love-in

Former police minister Rob Johnson snubbed party colleagues and Colin Barnett to rub shoulders with Labor at a Police Union function on Tuesday instead of attending the annual Liberal "love-in" retreat.

Mr Johnson, who is still resentful of being sacked by the Premier in 2012, was pictured smiling with his former opposite number, Labor's Michelle Roberts, at the launch of the union's new premises.

A union spokeswoman said Police Minister Liza Harvey was invited but declined because the event clashed with the love-in, held at Bunbury's Sanctuary Golf Resort.

Mr Johnson said he accepted the union's invitation before the Liberal event was organised.