A lobbyist, the son of former Qld housing minister Bruce Flegg, says he never lobbied his father, and they were very conscious of what was acceptable.

A former Queensland minister’s lobbyist son has denied ever lobbying his father.

Moggill MP Bruce Flegg is suing his former media adviser Graeme Hallett for defamation.

Dr Flegg was housing minister in November 2012 when Mr Hallett used a press conference to accuse him of misleading parliament by failing disclose contact with his lobbyist son Jonathan on an official register.

The allegations ultimately prompted Dr Flegg to resign as minister.

On Friday, Jonathan Flegg told the Supreme Court in Brisbane that he’d had wide-ranging conversations with his father from “everything to the Arab Spring to political machinations at home”.

But he said they always knew the boundaries of what was acceptable.

“I never lobbied my father,” Mr Flegg said.

“Lobbying is grey, but we decided to make it black and white and not engage in that activity.”

Mr Flegg worked in government relations for the lobbying firm Rowland when Mr Hallett made the allegations of undisclosed lobbying.

Mr Flegg said Mr Hallett had called him, asking for a list of emails he’d exchanged with his father because he was concerned about Dr Flegg’s lobbyist register, saying it needed to be updated.

“He said: ‘Jonathan, you do not know how bad this is, all of this is going end very badly’,” Mr Flegg said.

He said his father had later warned him that Mr Hallett “has gone rogue, he has double-crossed you” with the list of emails.

Mr Flegg also detailed his deep ties with the Liberal and Liberal National parties, working as an adviser to the NSW government, running in the NSW seat of Coogee and the federal seat of Ryan.

Dr Flegg is seeking compensation from Mr Hallett for the loss of his ministerial salary and the subsequent impact upon his superannuation.

The MP of 10 years has been barred by the Liberal National Party executive from re-contesting the seat of Moggill for the party at next year’s state election.