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 hibernica is listed in the following regions:
Canberra & Southern Tablelands
Maps
Attunga Point Banksia Street Wetland Corridor City Renewal Authority Area Cooma North Ridge Reserve Isaacs Ridge Isaacs Ridge and Nearby Lake Burley Griffin West Lyneham Wetland Red Hill Nature Reserve Sullivans Creek, Lyneham South Urambi Hills Wanniassa HillPlaces
Cooma, NSW Isaacs, ACT Red Hill, ACT