Unite general secretary Sharon Graham has told Deputy Prime Minister Angela Rayner the government can no longer say it is "nothing to do with us. We can't get involved".
Ms Gray joined the civil service straight from school and worked her way up to the Cabinet Office where, for six years, she led the government's Propriety and Ethics team, which provides advice to departments on standards issues.Polly Mackenzie - who worked as a special adviser in the Cabinet Office -
: "Sue has been there for so long, she knows everything that anybody has ever done wrong."In 2017, one of Sue Gray's investigations forced Damian Green - then one of Theresa May's most senior ministers - to step down after he was found to have made "inaccurate" statements over what he knew about claims pornography had been found on his office computer in 2008.She also investigated claims of sexual misconduct by the minister towards journalist Kate Maltby, ruling that her claims had been "plausible".
Speaking to the BBC, Ms Maltby said: "What impressed me most about Sue Gray was how seriously she took her duty of care to complainants... she was determined to listen to junior people, and not let senior staff off the hook."I found her profoundly moral in a way that isn't normally seen in Westminster."
Ms Gray's knowledge of ministers' private interests is said to have been useful to prime ministers carrying out rejigs of their team.
Chris Cook - an ex-BBC journalist who now works for news website Tortoise - said one sign of a forthcoming reshuffle would be when Sue Gray's office furniture had been re-arranged.Mr Fuller said he also sold catapults designed for target shooting, with a range of 50m (164ft) but would not sell to anyone under 18.
"Maybe an age restriction would be a compromise?" he added.Mr Rogers has until 27 May to raise enough signatures to get a response from the government or have the matter debated in Parliament.
"We speak to anglers and they don't use these types of catapult," he said."Anglers who would use a slingshot are doing it in a private lake, they're not walking round the streets taking random shots."