Thanks everyone for the input to this discussion. So far these points appear to be clearly legislated:
1. If there is no 'bikes only' signage, then it is a shared path, even when segregated.
2. If it is a shared path then it wouldn't matter what was pained on the ground, cyclists must give way by law.
3. Happy days, mothers and their children, off-leash dog walkers, ninja joggers and cyclists co-exist in a perfect carbon neutral society.
OK, maybe not point 3
Now, if I was walking along the section of infastructure given as an example in the photo of the boardwalk, and I accidentally step into the path of a cyclist who attempts to stop and loses traction in the rain on the wooden surface... can I be held liable for bending someones priceless antique Colnago commuter, or even worse be fined for committing an offence.
I will check the length of the harbour-side bike path to confirm if it is signed as being bikes only or not.
Also... these markings on the bike path appeared on Friday and seem to be a 'compliment' the rumble strips.