This area really needs a good single source of beta or a guide! I took a day trip out that way by myself yesterday... using these directions from Robin.
"from Melbourne take Calder Hwy to Romsey/Hanging rock turn off. Turn right and travel 3.6km then turn left at the Lancefield (Hanging Rock) rd. Straight along this for 7.1km to cross rd. Straight ahead at cross rd into Egans Rd, turn right at end. Travel 2.5km to 3 way fork, take the middle rd. From 3 way fork travel 1.5km to Y intersection then take the left rd for another 1.5km. A small group of boulders is just up on the right side of the rd. This is the first group of problems. A few short cracks, a flake problem and some slabby/seamy looking things. To get to the next group of problems walk 500m further down the rd to a steep motor bike trail on the right. This will lead you up to the main group of problems."
I thought the final distance was closer to 2.5km not 1.5km from the Y-intersection. If you can't see obvious boulders beside the road you haven't driven far enough!
The place is now covered in thick green regrowth from the fires - and getting around between problems can be quite a bush bashing affair! The rock is great quality and some of the problems look damn hard. I advise bringing a good thick bouldering mat and a spotter. The landings are generally pretty terrible with lots of blocky granite waiting to wipe out your ankles.
Can someone else write-up a bit more info for a permanent 'guide' section for this site? It would be great for others to be able to locate the info and history and have it recorded correctly.