I went looking for it in HMV the other day so I could check the credits to see if PSB were involved, but they didn't stock it! I haven't had a chance to check elsewhere yet, but will try tomorrow. It actually entered the physical singles chart at #36 this week, so someone must be selling it. It didn't make either the official top50 (digital + physical) or the digital download chart.
Well I checked it out today and I don't think PSB had any involvement in the Australian release. Mind you I didn't have my glasses and the credits were printed in about a 2 point font in light colour, so I couldn't be 100% certain.