There are now two species of Hedera naturalised in the ACT, and probably across much of southern Australia, viz Hedera helix and H. hibernica. This follows some work at the Melbourne herbarium, which also indicated that H. hibernica is far more common than H. helix. Where you can capturing the hairs on young leaves and stems will help with identification.
Main differences between Hedera helix and Hedera hibernica (Rosemary Purdie)
Table adapted from the Flora of Victoria (https://vicflora.rbg.vic.gov.au/flora/key/10902) and Valcarcel, V. and Vargas, P. (2010) Quantitative morphology and species delimitation under the general lineage concepts: Optimization for Hedera (Araliaceae). American Journal of Botany 97(9): 1555-1573.
Hedera sp. (helix or hibernica) is listed in the following regions:
Canberra & Southern Tablelands | South East South Australia
Maps
ANBG Aranda Bushland Black Mountain Blue Gum Point to Attunga Bay Bruce Ridge to Gossan Hill Caladenia Forest, O'Connor Callum Brae Dryandra St Woodland Emu Creek Flea Bog Flat to Emu Creek Corridor Flea Bog Flat, Bruce Gungaderra Grasslands Hassett Park, Campbell Hughes Garran Woodland Isaacs Ridge Isaacs Ridge and Nearby Lake Burley Griffin West Lake Tuggeranong Lions Youth Haven - Westwood Farm A.C.T. Mount Ainslie Mount Majura Mount Mugga Mugga Mount Taylor Red Hill Nature Reserve Red Hill to Yarralumla Creek Saint Mark's College & Grassland. Stranger Pond Sullivans Creek, Turner Umbagong District Park Urambi Hills Wanniassa Hill Watson Green Space Watson WoodlandsSurvey points
Point 73Places
Barton, ACT Hackett, ACT