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.
Another possibility is H. eriantha - see description at https://apps.lucidcentral.org/plants_se_nsw/text/entities/hakea_eriantha.htm where it says the nuts can be more or less smooth, and it is "Widely planted in Canberra. Naturalised in the ACT." We have it in our Flora list for Mt M and Mt A. Look at Hakea eriantha (Tree Hakea)
Hakea repullulans : Furze Hakea is the name given in ALA and VicFlora to the one Waltraud talks about above. See https://bie.ala.org.au/species/https://id.biodiversity.org.au/node/apni/2904740 and https://vicflora.rbg.vic.gov.au/flora/taxon/3380f985-a9aa-423d-a0c4-50d450e38cd6