Labor would be reduced to just a one-seat majority if the Rockingham by-election result was uniform across the State, new analysis of the result has shown. The analysis shows the swing against Labor of 22.5 per cent would be enough to reduce the party to 30 seats in the Parliament — the minimum required to govern. Speaking to reporters on Sunday after the by-election, Premier Roger Cook declared it was “back to work” for his team, stressing the Government needed to listen to the community. But an emboldened Liberal leader Libby Mettam, whose party saw a meagre 8 per cent rise in primary vote, said the result had put the Premier on notice. Labor suffered a swing of 22.5 percentage points on two party preferred support at the poll, which was called after the shock resignation of former Premier Mark McGowan. The party also saw its primary vote drop by 33 percentage points, to below 50 per cent, for the first time since 1996. A uniform result across the State would have a similar effect to the explosive Utting poll, published in The West Australian, which found the WA Liberals were in an election-winning position. While the swing means Labor still holds the seat on a healthy 15.2 per cent margin, it had previously been the safest in the State under McGowan. When applied to Labor’s 53 seats in the Assembly, the swing sees the Government losing 23 seats, reducing it to just 30 in the Legislative Assembly. Those include each of the shock wins from the 2021 State Election — Warren Blackwood, Nedlands, Churchlands, Carine, Bateman, South Perth, Riverton Scarborough, Kalgoorlie, Dawesville and Hillarys. Other seats at risk would be Perth seats won from the Liberals in 2017 including: Kalamunda, Bicton, Darling Range, Kingsley, Mount Lawley, Jandakot, and Murray Wellington. Long-held regional Labor seats of Albany, Collie-Preston and the Kimberley, along with the Pilbara would all be lost, while Bunbury would be line ball. Further analysis of the 33 per cent swing against Labor on primaries shows the vote collapsing in most of those seats, with little chance of those MPs able to recover votes through preferences. Labor finished the night on a primary of 49.4 per cent, while the Liberals were on 17.7 per cent. Former Labor Party member turned independent Hayley Edwards finished in third place on 16 per cent. The Legalise Cannabis Party finished in fourth on 6.7 per cent of the vote, while the Greens fell just short of 5 per cent. Following the Utting poll, the Premier encouraged Labor to be “humble”, a point he repeated on Sunday. “We need to continue to make sure that we listen to the community and respond to their concerns,” Mr Cook said. “We’ve got 18 months until the next election, so I’ve said to my team, it’s time to get back to work. “Make sure that you put in place a good positive plan for communities. It’s 18 months of hard work but this is a solid start.” The Premier said Labor did not take Rockingham, its previously safest seat where Mr McGowan received nearly 83 per cent of the primary vote in 2021, for granted. “Like I’ve always said we took nothing for granted in relation to Rockingham and that’s why we put forward a positive plan which focuses on the issues that concern people today,” he said. “This is a solid result for Labor and won of which we are very proud. “We knew that with any by-election, with its own unique set of circumstances and issues impacting on both the local, state and national level, that it was always going to be tough.” The Premier dismissed the claim his government had been put on notice, saying the Liberals “didn’t have a great night”. Ms Mettam said her party, which holds just two seats in the lower house, could take “much encouragement” from the swing in what was one of the safest Labor seats in the country. “A huge swing against the Labor government, clearly the Premier is on notice,” she said. Ms Mettam dismissed concerns that her party’s primary vote had only grown by 8 per cent. “We can understand that for some in protesting against the Labor government it was too much to vote for the Liberal Party in one of the safest Labor seats in the country,” she said. “But this is the best result for the Liberal Party in over a decade in WA Labor’s safest seat — it’s still an improvement on 2017.” Celebrating the 22 per cent swing towards the Liberals Ms Mettam, saying: “In any other seats, this seat would be changing hands.” “Labor should be very concerned about a 33 per cent swing against it on primaries and a 22 per cent swing towards the Liberals,” she said. Liberal candidate Peter Hudson said forcing Labor to rely on preferences to win the seat for the first time since Mr McGowan was initially elected showed the people of Rockingham were “listening to the Labor government’s failures”. “The shambolic implementation of the Aboriginal Cultural Heritage Act is an example of some of the worst policy ever implemented in the WA parliament,” Mr Hudson said. “The people of Rockingham, with a strong Liberal voice in Rockingham will not take the inadequacies of the Cook Labor Government.” Mr Cook said the Government would pursue any recommendations made by the implementation committee regarding changes to the Aboriginal Cultural Heritage Act. “If the implementation committee comes back to us with recommendations as a result of the listening, and the work that we’ve been doing with the stakeholders and community, we will make changes,” he said. “Those changes will be brought in in due course. “We have always taken a collaborative partnership approach to the implementation of the laws and that was something which I am I introduced very early on in my time.” Ms Edwards took to social media on Sunday to thank supporters, saying: “I was always realistic about the chances of winning being slim, but the energy in the air was that locals are seeking a change, in such short time to have a swing like we did is something to be proud of.” Rockingham member-elect Magenta Marshall, who joined Mr Cook for Sunday’s press conference, will become the youngest member of parliament. “I think it’s really exciting to be the youngest member and the only member under 30 in the WA state parliament. I’m excited to bring lots of energy and enthusiasm to the parliament,” she said. Ms Marshall’s victory means there is now more women than men in the Legislative Assembly — 30 to 29.