Is it a hakea? or grevillea? Perhaps a variant form of H. salficifolia? May be H. ulicina, the Furze Hakea? the wider leaf form H. ulicina var. latifolia (Leon Costermans, native trees and shrubs...)? we removed a lot of the non-local invader H. salficifolia from various areas on Mts Majura and Ainslie. From memory, the width of leaved varied. Unfortunately, the Hakea drop down list in NatureMapr search function stops at H. decurrens so I can't see what else NatureMapr offers We never know what people cultivate in their gardens and which of the garden plants go feral.