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 helix is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | South Coast | South East South Australia
Maps
Bruce Ridge City Renewal Authority Area Gungaderra Grasslands Haig Park Kangaroo Valley LB Block Manchester Square Mount Ainslie Mount Mugga Mugga Mount Rogers Stirling Park Sullivans Creek, Turner Wingecarribee Local Government AreaPlaces
Fraser, ACT Kaleen, ACT Kangaroo Valley, NSW Yarralumla, ACT