Hi Peter,
I got in an hour or so ago and have tested the phones. I've only charged the batteries for an hour before testing, and now that I read the manual, it says they should really be charged for 16 hours when completely flat - as they are right now.
The phones work fine as is, - but when I walk under a fluoro light they pick up a little hiss which was perceptible over the music. But I noticed that when I move just even a little away from fluoro tube lights, the sound quality was as you'd expect it to be.
I'll leave them charging for a few hours and see if there are any changes happening when operating with fully charged batteries. How does that sound?
Cheers